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Accounts Receivable (Details 3) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||
|---|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Mar. 31, 2013
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| Activity in the allowance for doubtful accounts | ||||
| Balance beginning of year | $ 79 | $ 66 | $ 81 | $ 75 |
| Additions charged to expense | 75 | 68 | 78 | |
| Deductions write-offs | (80) | (55) | (73) | |
| Change in revolving credit card program | (20) | |||
| Balance end of year | $ 74 | $ 79 | $ 66 | $ 75 |
| Period for recognition of reserve for portfolio bad debt | 5 years | |||
| X | ||||||||||
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- Definition
Represents the increase (decrease) in the allowance for doubtful accounts attributable to changes in the revolving credit card program. No definition available.
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| X | ||||||||||
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- Definition
Represents the period for recognition of reserve for portfolio bad debt maintained by the entity. No definition available.
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- Definition
Amount of direct write-downs of receivables charged against the allowance for doubtful accounts. No definition available.
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| X | ||||||||||
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- Definition
A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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- Definition
Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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