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Derivatives (Outstanding Derivative Balances) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Balance $ (774) $ (720)
Cash Collateral 516 478
Total Derivative Balance (258) (242)
Other Current Assets [Member]
   
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Balance 42 54
Netting (27) (39)
Cash Collateral 97 103
Total Derivative Balance 112 118
Other Noncurrent Assets [Member]
   
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Balance 96 113
Netting (43) (59)
Total Derivative Balance 53 54
Other Current Liabilities [Member]
   
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Balance (515) (489)
Netting 27 39
Cash Collateral 318 274
Total Derivative Balance (170) (176)
Other Noncurrent Liabilities [Member]
   
Derivatives And Hedging Activities [Line Items]    
Gross Derivative Balance (397) (398)
Netting 43 59
Cash Collateral 101 101
Total Derivative Balance $ (253) $ (238)