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Fair Value Measurements - Changes in Level 3 Assets and Liabilities that are Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs (Details) - Derivative Financial Instruments, Assets - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Total realized/unrealized gains (losses):        
Fair value, beginning of period $ (2) $ 50 $ 41 $ 78
Included in earnings 8 18 (7) 27
Included in other comprehensive income 0 (4) 1 (9)
Purchases 0 (5) (1) (2)
Settlements (6) (6) (34) (41)
Fair value, end of period 0 53 0 53
Unrealized gains (losses) relating to instruments held at the end of the period $ 0 $ 5 $ 0 $ (11)