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Condensed Consolidated Statements of Comprehensive (Loss)/Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Unrealized gain/(loss) on derivatives, income tax expense $ 0 $ 0 $ 1 $ 0
Foreign currency translation adjustments, income tax expense 0 0 0 0
Available-for-sale securities,income tax expense 0 0 0 0
Defined benefit plans, income tax expense $ 0 $ 0 $ 0 $ 0