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Condensed Consolidated Statements of Comprehensive Income/(Loss) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Unrealized gain/(loss) on derivatives, income tax expense $ 0 $ 0 $ 0 $ 1
Foreign currency translation adjustments, income tax expense 0 0 0 0
Defined benefit plans, income tax expense $ 0 $ 0 $ 0 $ 0