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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Income tax expense (benefit) on unrealized gains (losses) on hedging instruments $ 5 $ 1 $ 5
Income tax (expense) on amortization of net loss and prior service cost previously recognized 15 14 18
Income tax expense (benefit) on net (loss) gain arising during the period $ 4 $ 42 $ 69