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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (Parenthetical) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Tax expense (benefit) on cash flow hedges reclassified from AOCI to net income $ 3,000,000 $ 4,000,000
Tax expense (benefit) of unrealized gains/losses on available for sale securities still held (2,000,000) 26,000,000
Tax expense (benefit) on available for sale securities reclassified from AOCI to net income (2,000,000) (10,000,000)
Tax expense (benefit) of defined benefit pension and other benefits plans (1,000,000) (2,000,000)
Tax expense (benefit) of foreign currency translation 0 1,000,000
Tax expense (benefit) of other comprehensive income (loss) related to equity method investee 1,000,000 1,000,000
Tax expense (benefit) related to NEP deconsolidation gain $ 15,000,000 $ 0