Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Interest Rate Swap Arrangements (Debt) (Details)

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Long-Term Debt and Interest Rate Swap Arrangements (Debt) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Debt and capital lease obligations $ 3,881 $ 3,477
Current portion of debt and capital lease obligations (11) (12)
Long-term portion of debt and capital lease obligations 3,870 3,465
7.125% Senior Secured Notes due 2017
   
Debt Instrument [Line Items]    
Debt and capital lease obligations 0 500
7.5% Senior Secured Notes due 2019, net of original issue discount
   
Debt Instrument [Line Items]    
Debt and capital lease obligations 760 988
7.375% Senior Secured Notes due 2020
   
Debt Instrument [Line Items]    
Debt and capital lease obligations 500 500
5.125% Senior Secured Notes due 2022
   
Debt Instrument [Line Items]    
Debt and capital lease obligations 500 500
4.375% Senior Secured Notes due 2023, net of original issue discount
   
Debt Instrument [Line Items]    
Debt and capital lease obligations 750 0
5.95% Senior Secured Notes due 2043, net of original issue discount
   
Debt Instrument [Line Items]    
Debt and capital lease obligations 300 0
Senior secured credit facility
   
Debt Instrument [Line Items]    
Debt and capital lease obligations 990 903
Capital lease obligations
   
Debt Instrument [Line Items]    
Debt and capital lease obligations $ 81 $ 86