Registration of securities issued in business combination transactions

Guarantor/Non-Guarantor Subsidiary Financial Information (Effect of the Adjustment on Equity) (Details)

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Guarantor/Non-Guarantor Subsidiary Financial Information (Effect of the Adjustment on Equity) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]          
Equity $ 6,112 $ 6,341 $ 6,834 $ 8,019 $ 7,654
As previously reported
          
Condensed Financial Statements, Captions [Line Items]          
Equity       8,019  
Adjustment
          
Condensed Financial Statements, Captions [Line Items]          
Equity       0  
Parent company
          
Condensed Financial Statements, Captions [Line Items]          
Equity 5,996 6,222 6,690 7,890  
Parent company | As previously reported
          
Condensed Financial Statements, Captions [Line Items]          
Equity       7,890  
Parent company | Adjustment
          
Condensed Financial Statements, Captions [Line Items]          
Equity       0  
Guarantor subsidiaries
          
Condensed Financial Statements, Captions [Line Items]          
Equity 4,146 4,248 4,466 3,915  
Guarantor subsidiaries | As previously reported
          
Condensed Financial Statements, Captions [Line Items]          
Equity       3,465  
Guarantor subsidiaries | Adjustment
          
Condensed Financial Statements, Captions [Line Items]          
Equity       450  
Non-guarantor subsidiaries
          
Condensed Financial Statements, Captions [Line Items]          
Equity 2,464 2,393 2,360 2,181  
Non-guarantor subsidiaries | As previously reported
          
Condensed Financial Statements, Captions [Line Items]          
Equity       1,716  
Non-guarantor subsidiaries | Adjustment
          
Condensed Financial Statements, Captions [Line Items]          
Equity       465  
Eliminations
          
Condensed Financial Statements, Captions [Line Items]          
Equity (6,494) (6,522) (6,682) (5,967)  
Eliminations | As previously reported
          
Condensed Financial Statements, Captions [Line Items]          
Equity       (5,052)  
Eliminations | Adjustment
          
Condensed Financial Statements, Captions [Line Items]          
Equity       $ (915)