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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value Measurements [Abstract]        
Balance at beginning of period $ (8) $ (56) $ (8) $ (19)
Included in earnings $ 3 $ 6 $ (3) $ (46)
Included in other comprehensive loss        
Purchases, issuances, and settlements:        
Purchases        
Issuances        
Settlements   $ (5) $ 6 $ 10
Transfers into/out of Level 3        
Balance at end of period $ (5) $ (55) $ (5) $ (55)
Change in gains (losses) included in earnings relating to derivatives still held as of June 30 $ 3 $ 1 $ 3 $ (36)