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Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities $ 667 $ 642
Net cash used in investing activities (265) (178)
Net cash used in financing activities (393) (532)
Effect of foreign exchange rates 0 (6)
Net increase (decrease) in cash and cash equivalents 9 (74)
Cash and cash equivalents at beginning of period 43 352
Cash and cash equivalents at end of period 52 278
Eliminations    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities 0 0
Net cash used in investing activities 0 0
Net cash used in financing activities 0 0
Effect of foreign exchange rates 0 0
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of period 0 0
Cash and cash equivalents at end of period 0 0
Parent | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities 5 5
Net cash used in investing activities (5) (5)
Net cash used in financing activities 0 0
Effect of foreign exchange rates 0 0
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of period 0 0
Cash and cash equivalents at end of period 0 0
URNA | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities 566 626
Net cash used in investing activities (256) (164)
Net cash used in financing activities (287) (436)
Effect of foreign exchange rates 0 0
Net increase (decrease) in cash and cash equivalents 23 26
Cash and cash equivalents at beginning of period 1 23
Cash and cash equivalents at end of period 24 49
Guarantor Subsidiaries | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities 0 (1)
Net cash used in investing activities 0 0
Net cash used in financing activities 0 1
Effect of foreign exchange rates 0 0
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of period 0 0
Cash and cash equivalents at end of period 0 0
Non-Guarantor Subsidiaries - Foreign | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities 35 (84)
Net cash used in investing activities (4) (9)
Net cash used in financing activities (45) (1)
Effect of foreign exchange rates 0 (6)
Net increase (decrease) in cash and cash equivalents (14) (100)
Cash and cash equivalents at beginning of period 42 329
Cash and cash equivalents at end of period 28 229
Non Guarantor Subsidiaries- SPV | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities 61 96
Net cash used in investing activities 0 0
Net cash used in financing activities (61) (96)
Effect of foreign exchange rates 0 0
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of period 0 0
Cash and cash equivalents at end of period $ 0 $ 0