XML 74 R64.htm IDEA: XBRL DOCUMENT v3.3.1.900
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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value Measurements [Abstract]    
Balance at beginning of year $ (8) $ (19)
Included in earnings $ 9 $ 23
Purchases, issuances, and settlements:    
Purchases
Issuances
Settlements $ 2 $ (12)
Transfers into/out of Level 3
Balance at end of year $ 3 $ (8)
Change in gains (losses) included in earnings relating to derivatives still held as of December 31 $ 11 $ 11