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Condensed Consolidated Statements of Comprehensive Income/(Loss) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Unrealized gain on derivatives, income tax expense $ 0 $ 1
Foreign currency translation adjustments, income tax expense 0 0
Defined benefit plans, income tax expense $ 0 $ 0