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Risk Management and Fair Values (Reconciliation Of Changes In The Net Assets (Liabilities) For The Fair Value Of Derivatives Classified As Level 3 In The Fair Value Hierarchy) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reconciliation of changes in the net assets (liabilities) for the fair value of derivatives classified as Level 3 in the fair value hierarchy        
Realized Gains Losses Due To Ineffectiveness $ (6) $ (4) $ (29) $ (5)
Balance as of Beginning of Period 83 375 178 312
Unrealized gains from price changes 9 (92) (62) 136
Unrealized gains on originations (1)     7
Realized gains on settlements (36) (61) (38) (232)
Balance as of End of Period $ 49 $ 218 $ 49 $ 218