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Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING CASH FLOW INFORMATION (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities $ 1,590 $ 1,649
Net cash used in investing activities (1,006) (1,005)
Net cash used in financing activities (552) (870)
Effect of foreign exchange rates 0 (9)
Net increase (decrease) in cash and cash equivalents 32 (235)
Cash and cash equivalents at beginning of period 43 352
Cash and cash equivalents at end of period 75 117
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
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 9 12
Net cash used in investing activities (9) (12)
Net cash used in financing activities 0 0
Effect of foreign exchange rates   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 1,457 1,714
Net cash used in investing activities (943) (920)
Net cash used in financing activities (464) (773)
Effect of foreign exchange rates   0
Net increase (decrease) in cash and cash equivalents 50 21
Cash and cash equivalents at beginning of period 1 23
Cash and cash equivalents at end of period 51 44
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
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 83 (66)
Net cash used in investing activities (54) (73)
Net cash used in financing activities (47) (108)
Effect of foreign exchange rates   (9)
Net increase (decrease) in cash and cash equivalents (18) (256)
Cash and cash equivalents at beginning of period 42 329
Cash and cash equivalents at end of period 24 73
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by operating activities 41 (10)
Net cash used in investing activities 0 0
Net cash used in financing activities (41) 10
Effect of foreign exchange rates   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