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Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities $ 2,853 $ 2,209 $ 1,941
Net cash used in investing activities (4,551) (3,684) (847)
Net cash provided by (used in) financing activities 1,397 1,497 (964)
Effect of foreign exchange rates (8) 18 3
Net (decrease) increase in cash and cash equivalents (309) 40 133
Cash and cash equivalents at beginning of year 352 312 179
Cash and cash equivalents at end of year 43 352 312
Eliminations      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 0 0 0
Net cash used in investing activities 0 0 0
Net cash provided by (used in) financing activities 0 0 0
Effect of foreign exchange rates 0 0 0
Net (decrease) increase in cash and cash equivalents 0 0 0
Cash and cash equivalents at beginning of year 0 0 0
Cash and cash equivalents at end of year 0 0 0
Parent | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 36 21 9
Net cash used in investing activities (36) (21) (9)
Net cash provided by (used in) financing activities 0 0 0
Effect of foreign exchange rates 0 0 0
Net (decrease) increase in cash and cash equivalents 0 0 0
Cash and cash equivalents at beginning of year 0 0 0
Cash and cash equivalents at end of year 0 0 0
URNA | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 3,116 2,291 1,762
Net cash used in investing activities (4,308) (3,554) (832)
Net cash provided by (used in) financing activities 1,170 1,265 (927)
Effect of foreign exchange rates 0 0 0
Net (decrease) increase in cash and cash equivalents (22) 2 3
Cash and cash equivalents at beginning of year 23 21 18
Cash and cash equivalents at end of year 1 23 21
Guarantor Subsidiaries | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (1) (3) (3)
Net cash used in investing activities 0 0 0
Net cash provided by (used in) financing activities 1 3 3
Effect of foreign exchange rates 0 0 0
Net (decrease) increase in cash and cash equivalents 0 0 0
Cash and cash equivalents at beginning of year 0 0 0
Cash and cash equivalents at end of year 0 0 0
Foreign | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (16) 132 136
Net cash used in investing activities (207) (109) (6)
Net cash provided by (used in) financing activities (56) (3) (3)
Effect of foreign exchange rates (8) 18 3
Net (decrease) increase in cash and cash equivalents (287) 38 130
Cash and cash equivalents at beginning of year 329 291 161
Cash and cash equivalents at end of year 42 329 291
SPV | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (282) (232) 37
Net cash used in investing activities 0 0 0
Net cash provided by (used in) financing activities 282 232 (37)
Effect of foreign exchange rates 0 0 0
Net (decrease) increase in cash and cash equivalents 0 0 0
Cash and cash equivalents at beginning of year 0 0 0
Cash and cash equivalents at end of year $ 0 $ 0 $ 0