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Financial Information for Subsidiary Guarantors and Non-Guarantors - Cash Flows (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash Flows    
Cash provided by (utilized in) operating activities $ (156) $ (110)
Cash utilized in investing activities (205) (190)
Cash provided by (utilized in) financing activities 185 238
Effect of exchange rate change on cash 19 (3)
Decrease in cash (157) (65)
Cash at beginning of period 492 399
Cash at end of period 335 334
Parent    
Cash Flows    
Cash provided by (utilized in) operating activities (26) (24)
Cash provided by (utilized in) financing activities 26 24
Non-Guarantor Subsidiaries    
Cash Flows    
Cash provided by (utilized in) operating activities (130) (86)
Cash utilized in investing activities (205) (190)
Cash provided by (utilized in) financing activities 159 214
Effect of exchange rate change on cash 19 (3)
Decrease in cash (157) (65)
Cash at beginning of period 492 399
Cash at end of period $ 335 $ 334