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Franchises, Goodwill and Other Intangible Assets (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Indefinite-lived intangible assets [Abstract]          
Franchise Rights $ 5,257   $ 5,257   $ 5,257
Goodwill 951   951   951
Trademark 158   158   158
Carrying value - indefinite-lived intangible assets 6,366   6,366   6,366
Finite-lived intangible assets [Abstract]          
Gross carrying amount 2,426   2,426   2,411
Accumulated amortization 524   524   365
Net carrying value 1,902   1,902   2,046
Amortization expense related to customer relationships and other intangible 80 84 159 170  
Finite-lived assets, Future Amortization Expense [Abstract]          
6 months ending December 31, 2011     156    
2012     289    
2013     262    
2014     236    
2015     210    
2016     183    
Thereafter     566    
Total     1,902    
Customer Relationships [Member]
         
Finite-lived intangible assets [Abstract]          
Gross carrying amount 2,358   2,358   2,358
Accumulated amortization 512   512   358
Net carrying value 1,846   1,846   2,000
Other Intangible Assets [Member]
         
Finite-lived intangible assets [Abstract]          
Gross carrying amount 68   68   53
Accumulated amortization 12   12   7
Net carrying value $ 56   $ 56   $ 46