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Long-Term Debt and Interest Rate Swap Arrangements (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 3 Months Ended | |||||||||||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2013
Short-term debt
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Dec. 31, 2012
Short-term debt
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Jun. 30, 2013
7.125% Senior Secured Notes due 2017
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Mar. 31, 2013
7.125% Senior Secured Notes due 2017
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Sep. 30, 2013
7.125% Senior Secured Notes due 2017
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Dec. 31, 2012
7.125% Senior Secured Notes due 2017
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Mar. 31, 2013
7.5% Senior Secured Notes due 2019, net of original issue discount
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Sep. 30, 2013
7.5% Senior Secured Notes due 2019, net of original issue discount
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Dec. 31, 2012
7.5% Senior Secured Notes due 2019, net of original issue discount
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Sep. 30, 2013
7.375% Senior Secured Notes due 2020
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Dec. 31, 2012
7.375% Senior Secured Notes due 2020
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Sep. 30, 2013
5.125% Senior Secured Notes due 2022
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Dec. 31, 2012
5.125% Senior Secured Notes due 2022
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Sep. 30, 2013
4.375% Senior Secured Notes due 2023, net of original issue discount
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Dec. 31, 2012
4.375% Senior Secured Notes due 2023, net of original issue discount
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Sep. 30, 2013
5.95% Senior Secured Notes due 2043, net of original issue discount
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Dec. 31, 2012
5.95% Senior Secured Notes due 2043, net of original issue discount
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| Debt Instrument [Line Items] | |||||||||||||||||||||||
| Debt and capital lease obligations | $ 3,862,000,000 | $ 3,862,000,000 | $ 3,477,000,000 | $ 300,000,000 | $ 0 | $ 0 | $ 500,000,000 | $ 760,000,000 | $ 988,000,000 | $ 500,000,000 | $ 500,000,000 | $ 500,000,000 | $ 500,000,000 | $ 750,000,000 | $ 0 | $ 300,000,000 | $ 0 | ||||||
| Short-term debt, percentage bearing fixed interest rate | 0.50% | 0.50% | |||||||||||||||||||||
| Line of credit facility maximum borrowing capacity | 2,000,000,000 | 2,000,000,000 | |||||||||||||||||||||
| Line of credit facility standby letter of credit | 250,000,000 | 250,000,000 | |||||||||||||||||||||
| Line of credit facility uncommitted loan | 1,000,000,000 | 1,000,000,000 | |||||||||||||||||||||
| Debt instrument lower range of basis spread on variable rate | 0.25% | 0.25% | |||||||||||||||||||||
| Debt instrument higher range of basis spread on variable rate | 2.00% | 2.00% | |||||||||||||||||||||
| Line of credit facility remaining borrowing capacity | 1,300,000,000 | 1,300,000,000 | |||||||||||||||||||||
| Line of credit facility interest rate at period end | 2.00% | 2.00% | |||||||||||||||||||||
| Principal amount of tender offer | 500,000,000 | 250,000,000 | |||||||||||||||||||||
| Debt instrument interest rate stated percentage | 7.125% | 7.50% | 7.375% | 5.125% | 4.375% | 5.95% | |||||||||||||||||
| Extinguishment of debt amount | 376,000,000 | 124,000,000 | 231,000,000 | ||||||||||||||||||||
| Repurchase price of individual bonds including premium | 1,035.63 | 1,039.40 | 1,120 | ||||||||||||||||||||
| Face value of individual bonds repurchased | 1,000 | 1,000 | 1,000 | ||||||||||||||||||||
| Debt issuance price percentage | 99.968% | 99.973% | |||||||||||||||||||||
| Loss on extinguishment of debt | 0 | 0 | (57,000,000) | 0 | |||||||||||||||||||
| Notional amount of interest rate derivative instruments not designated as hedging instruments | 3,100,000,000 | ||||||||||||||||||||||
| Interest rate derivatives at fair value net | 12,000,000 | ||||||||||||||||||||||
| Interest rate derivative liabilities at fair value | 13,000,000 | ||||||||||||||||||||||
| Interest rate derivative assets at fair value | $ 1,000,000 | ||||||||||||||||||||||
| Debt weighted average interest rate | 4.90% | 4.90% | |||||||||||||||||||||