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Financial Information for Subsidiary Guarantors and Non-Guarantors - Cash Flows (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash Flows    
Cash provided by (utilized in) operating activities $ 37 $ 220
Cash utilized in investing activities (200) (282)
Cash provided by (utilized in) financing activities (14) (39)
Effect of exchange rate change on cash 24 (4)
Decrease in cash (153) (105)
Cash at beginning of period 492 399
Cash at end of period 339 294
Parent    
Cash Flows    
Cash provided by (utilized in) operating activities (50) (45)
Cash provided by (utilized in) financing activities 50 45
Non-Guarantor Subsidiaries    
Cash Flows    
Cash provided by (utilized in) operating activities 87 265
Cash utilized in investing activities (200) (282)
Cash provided by (utilized in) financing activities (64) (84)
Effect of exchange rate change on cash 24 (4)
Decrease in cash (153) (105)
Cash at beginning of period 492 399
Cash at end of period $ 339 $ 294