Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 644	$ 667
Net cash used in investing activities	(39)	(265)
Net cash used in financing activities	(142)	(393)
Effect of foreign exchange rates	(2)	0
Net increase in cash and cash equivalents	461	9
Cash and cash equivalents at beginning of period	52	43
Cash and cash equivalents at end of period	513	52
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 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	18	5
Net cash used in investing activities	(18)	(5)
Net cash used in financing activities	0	0
Effect of foreign exchange rates	0	0
Net increase 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	483	566
Net cash used in investing activities	(15)	(256)
Net cash used in financing activities	(23)	(287)
Effect of foreign exchange rates	0	0
Net increase in cash and cash equivalents	445	23
Cash and cash equivalents at beginning of period	28	1
Cash and cash equivalents at end of period	473	24
Guarantor Subsidiaries | Reportable Legal Entities
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 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	39	35
Net cash used in investing activities	(6)	(4)
Net cash used in financing activities	(15)	(45)
Effect of foreign exchange rates	(2)	0
Net increase in cash and cash equivalents	16	(14)
Cash and cash equivalents at beginning of period	24	42
Cash and cash equivalents at end of period	40	28
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	104	61
Net cash used in investing activities	0	0
Net cash used in financing activities	(104)	(61)
Effect of foreign exchange rates	0	0
Net increase 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