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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,293	$ 2,731	$ 2,541
Total other comprehensive (loss) income	(121)	(13)	22
Balance at end of period	34,595	2,293	2,731
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(16)	(14)
Other comprehensive (loss) income before reclassifications	(134)	(5)
Amounts reclassified from accumulated other comprehensive loss	9	3
Total other comprehensive (loss) income	(125)	(2)
Balance at end of period	(141)	(16)	(14)
Cash Flow Hedges | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption		3
Cash Flow Hedges | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption		(3)
Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(49)	(38)
Other comprehensive (loss) income before reclassifications	16	(11)
Amounts reclassified from accumulated other comprehensive loss	0	0
Total other comprehensive (loss) income	16	(11)
Balance at end of period	(33)	(49)	(38)
Foreign Currency Translation | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption		0
Foreign Currency Translation | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption		0
Pension Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(2)	(2)
Other comprehensive (loss) income before reclassifications	(4)	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Total other comprehensive (loss) income	(4)	0
Balance at end of period	(6)	(2)	(2)
Pension Plans | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption		0
Pension Plans | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption		0
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(67)	(54)	(76)
Other comprehensive (loss) income before reclassifications	(122)	(16)
Amounts reclassified from accumulated other comprehensive loss	9	3
Total other comprehensive (loss) income	(113)	(13)	22
Balance at end of period	$ (180)	(67)	$ (54)
Total | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption		3		$ 3
Total | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption		$ (3)		$ (3)

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