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Consolidated Statements of Comprehensive (Loss)/Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Unrealized gain/(loss) on derivatives, income tax expense $ 0 $ 1 $ 1
Foreign currency translation adjustments, income tax benefit 0 (2) 0
Available-for-sale securities, income tax expense 0 10 0
Defined benefit plan, income tax (benefit)/expense $ 0 $ (21) $ 0