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Financial Information for Subsidiary Guarantors and Non-Guarantors - Cash Flows (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash Flows    
Total cash provided by (utilized in) operating activities $ 103 $ 187
Cash utilized in investing activities (2,638) (269)
Cash provided by (utilized in) financing activities 2,322 (27)
Effect of exchange rate fluctuations on cash (29) (10)
Decrease in cash (242) (119)
Cash at beginning of period 512 383
Cash at end of period 270 264
Parent    
Cash Flows    
Total cash provided by (utilized in) operating activities (58) (72)
Cash provided by (utilized in) financing activities 58 72
Non-Guarantor Subsidiaries    
Cash Flows    
Total cash provided by (utilized in) operating activities 161 259
Cash utilized in investing activities (2,638) (269)
Cash provided by (utilized in) financing activities 2,264 (99)
Effect of exchange rate fluctuations on cash (29) (10)
Decrease in cash (242) (119)
Cash at beginning of period 512 383
Cash at end of period $ 270 $ 264