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Derivatives and Risk Management Activities (Details 6) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Level 3
         
Roll forward of Level 3 Net Asset          
Beginning Balance     $ (14) $ 12 $ (14)
Unrealized gains/(losses):          
Included in earnings       (3) 17
Included in other comprehensive income       3 2
Settlements       (22) 21
Derivatives entered into during the period       23 3
Transfers out of Level 3 (liability)   5      
Transfers out of Level 3 (asset) (14)   (17) (9) (17)
Ending Balance       4 12
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods       24 22
Recurring Fair Value Measures | Level 1
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       1 80
Recurring Fair Value Measures | Level 1 | Commodity
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       1 80
Recurring Fair Value Measures | Level 2
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       (3) (135)
Recurring Fair Value Measures | Level 2 | Commodity
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       35 1
Recurring Fair Value Measures | Level 2 | Interest Rate Contracts
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       (38) (137)
Recurring Fair Value Measures | Level 2 | Foreign exchange contracts
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value         1
Recurring Fair Value Measures | Level 3
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       4 12
Recurring Fair Value Measures | Level 3 | Commodity
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       4 12
Recurring Fair Value Measures | Total
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       2 (43)
Recurring Fair Value Measures | Total | Commodity
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       40 93
Recurring Fair Value Measures | Total | Interest Rate Contracts
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value       (38) (137)
Recurring Fair Value Measures | Total | Foreign exchange contracts
         
Recurring Fair Value Measures          
Net asset/(liability) at fair value         $ 1