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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,394	$ 2,971	$ 2,293	$ 2,731
Total other comprehensive loss	(108)	(10)	(126)	(12)
Balance at end of period	2,546	2,850	2,546	2,850
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 before reclassifications			(130)	(5)
Amounts reclassified from accumulated other comprehensive loss			2	(1)
Total other comprehensive loss			(128)	(6)
Balance at end of period	(144)	(20)	(144)	(20)
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 before reclassifications			2	(6)
Amounts reclassified from accumulated other comprehensive loss			0	0
Total other comprehensive loss			2	(6)
Balance at end of period	(47)	(44)	(47)	(44)
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			(2)	(2)
Other comprehensive loss before reclassifications			0	0
Amounts reclassified from accumulated other comprehensive loss			0	0
Total other comprehensive loss			0	0
Balance at end of period	(2)	(2)	(2)	(2)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(85)	(56)	(67)	(54)
Other comprehensive loss before reclassifications			(128)	(11)
Amounts reclassified from accumulated other comprehensive loss			2	(1)
Total other comprehensive loss	(108)	(10)	(126)	(12)
Balance at end of period	$ (193)	$ (66)	$ (193)	$ (66)
Accounting Standards Update 2018-02 | Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption					$ (3)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption						$ 3
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption						0
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption						0
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-12 | Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption					$ 3	3
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption						(3)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Foreign Currency Translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption						0
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption						0
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative-effect adjustment of ASU adoption						$ (3)

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