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Consolidated Statements of Comprehensive (Loss)/Income (Parenthetical) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Unrealized gain/(loss) on derivatives, net of income tax expense of $1, $1, and $19 $ 1 $ 1 $ 19
Foreign currency translation adjustments, net of income tax benefit of $(2), $0, and $0 2 0 0
Available-for-sale securities, net of income tax expense/(benefit) of $10, $0, and $(3) 10 0 (3)
Defined benefit plan, net of income tax (benefit)/expense of $(21), $0 and $69 $ (21) $ 0 $ 69