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Fair Value Measurements (Reconciliations For Change In Net Fair Value Of Derivative Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value Measurements [Abstract]        
Balance at beginning of period $ (5) $ (55) $ (8) $ (19)
Included in earnings $ 4 $ 18 $ 1 $ (27)
Included in other comprehensive loss
Purchases, issuances, and settlements:        
Purchases
Issuances
Settlements   $ (9) $ 6  
Transfers into/out of Level 3
Balance at end of period $ (1) $ (46) $ (1) $ (46)
Change in gains (losses) included in earnings relating to derivatives still held as of September 30 $ 4 $ 9 $ 7 $ (27)