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Financial Information for Subsidiary Guarantors and Non-Guarantors - Cash Flows (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash Flows    
Cash provided by (utilized in) operating activities $ (337) $ (302)
Cash utilized in investing activities (114) (133)
Cash provided by (utilized in) financing activities 257 276
Effect of exchange rate change on cash 14 (1)
Decrease in cash (180) (160)
Cash at beginning of period 492 399
Cash at end of period 312 239
Parent    
Cash Flows    
Cash provided by (utilized in) operating activities (12) (11)
Cash provided by (utilized in) financing activities 12 11
Non-Guarantor Subsidiaries    
Cash Flows    
Cash provided by (utilized in) operating activities (325) (291)
Cash utilized in investing activities (114) (133)
Cash provided by (utilized in) financing activities 245 265
Effect of exchange rate change on cash 14 (1)
Decrease in cash (180) (160)
Cash at beginning of period 492 399
Cash at end of period $ 312 $ 239