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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 $ 265 $ 161
Cash utilized in investing activities (282) (2,638)
Cash provided by (utilized in) financing activities (84) 2,264
Effect of exchange rate on cash (4) (29)
Net change in cash (105) (242)
Cash at beginning of period 399 512
Cash at end of period 294 270
Issuer    
Cash Flows    
Cash provided by (utilized in) operating activities 108 72
Cash utilized in investing activities (66) (2,393)
Cash provided by (utilized in) financing activities (42) 2,321
Guarantor Subsidiaries    
Cash Flows    
Cash provided by (utilized in) operating activities 10 143
Cash utilized in investing activities (1) (1)
Cash provided by (utilized in) financing activities   (157)
Net change in cash 9 (15)
Cash at beginning of period 6 29
Cash at end of period 15 14
Non-Guarantor Subsidiaries    
Cash Flows    
Cash provided by (utilized in) operating activities 147 (74)
Cash utilized in investing activities (215) (2,525)
Cash provided by (utilized in) financing activities (42) 2,401
Effect of exchange rate on cash (4) (29)
Net change in cash (114) (227)
Cash at beginning of period 393 483
Cash at end of period $ 279 256
Eliminations    
Cash Flows    
Cash provided by (utilized in) operating activities   20
Cash utilized in investing activities   2,281
Cash provided by (utilized in) financing activities   $ (2,301)