Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 2,288	$ 2,582
Net cash used in investing activities	(286)	(1,749)
Net cash used in financing activities	(1,881)	(816)
Effect of foreign exchange rates	1	0
Net increase in cash and cash equivalents	122	17
Cash and cash equivalents at beginning of period	52	43
Cash and cash equivalents at end of period	174	60
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	41	21
Net cash used in investing activities	(41)	(21)
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	1,871	2,403
Net cash used in investing activities	(235)	(1,592)
Net cash used in financing activities	(1,638)	(777)
Effect of foreign exchange rates	0	0
Net increase in cash and cash equivalents	(2)	34
Cash and cash equivalents at beginning of period	28	1
Cash and cash equivalents at end of period	26	35
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	146	151
Net cash used in investing activities	(10)	(136)
Net cash used in financing activities	(13)	(32)
Effect of foreign exchange rates	1	0
Net increase in cash and cash equivalents	124	(17)
Cash and cash equivalents at beginning of period	24	42
Cash and cash equivalents at end of period	148	25
Non Guarantor Subsidiaries - SPV | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	230	7
Net cash used in investing activities	0	0
Net cash used in financing activities	(230)	(7)
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