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Financial Information for Subsidiary Guarantors and Non-Guarantors - Cash Flows (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash Flows    
Cash provided by (utilized in) operating activities $ 220 $ 103
Cash utilized in investing activities (282) (2,638)
Cash provided by (utilized in) financing activities (39) 2,322
Effect of exchange rate change on cash (4) (29)
Decrease in cash (105) (242)
Cash at beginning of period 399 512
Cash at end of period 294 270
Parent    
Cash Flows    
Cash provided by (utilized in) operating activities (45) (58)
Cash provided by (utilized in) financing activities 45 58
Non-Guarantor Subsidiaries    
Cash Flows    
Cash provided by (utilized in) operating activities 265 161
Cash utilized in investing activities (282) (2,638)
Cash provided by (utilized in) financing activities (84) 2,264
Effect of exchange rate change on cash (4) (29)
Decrease in cash (105) (242)
Cash at beginning of period 399 512
Cash at end of period $ 294 $ 270