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Derivative Instruments and Hedging Activities (Changes in AOCI Related to Derivative Gains (Losses)) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income [Roll Forward]        
Balance of Accumulated Other Comprehensive Income at Beginning of Period $ (591)   $ (450)  
Unrealized gains (losses) (44)   (211)  
Losses (gains) reclassified to earnings 12   30  
Tax effect (15)   (7)  
Balance of Accumulated Other Comprehensive Income at End of period (638)   (638)  
Deferred Gain (Loss) On Hedging Activities [Member]
       
Accumulated Other Comprehensive Income [Roll Forward]        
Balance of Accumulated Other Comprehensive Income at Beginning of Period 11 4 4 30
Unrealized gains (losses) (7) 76 2 22
Losses (gains) reclassified to earnings (3) (2) 0 11
Tax effect 5 (28) 0 (13)
Balance of Accumulated Other Comprehensive Income at End of period $ 6 $ 50 $ 6 $ 50