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Financial Information for Subsidiary Guarantors and Non-Guarantors - Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash Flows      
Cash provided by (utilized in) operating activities $ 751 $ 608 $ 675
Cash utilized in investing activities (417) (2,748) (455)
Cash provided by (utilized in) financing activities (228) 2,057 (70)
Effect of exchange rate change on cash (13) (30) (21)
Increase (decrease) in cash 93 (113) 129
Cash and cash equivalents at beginning of period 399 512 383
Cash and cash equivalents at end of period 492 399 512
Parent      
Cash Flows      
Cash provided by (utilized in) operating activities (125) (138) (148)
Cash provided by (utilized in) financing activities 125 138 148
Non-Guarantor Subsidiaries      
Cash Flows      
Cash provided by (utilized in) operating activities 876 746 823
Cash utilized in investing activities (417) (2,748) (455)
Cash provided by (utilized in) financing activities (353) 1,919 (218)
Effect of exchange rate change on cash (13) (30) (21)
Increase (decrease) in cash 93 (113) 129
Cash and cash equivalents at beginning of period 399 512 383
Cash and cash equivalents at end of period $ 492 $ 399 $ 512