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Debt and Capital Leases - Narrative (Details) - USD ($) $ in Millions		9 Months Ended
	Mar. 21, 2018	Sep. 30, 2018	Nov. 05, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt amount		$ 7,436		$ 9,494
Recourse Debt
Debt Instrument [Line Items]
Debt amount		7,167		7,182
Term loan facility, due 2023 | Recourse Debt
Debt Instrument [Line Items]
Debt amount		$ 1,857		$ 1,872
Term loan facility, due 2023 | Recourse Debt | Subsequent Event
Debt Instrument [Line Items]
Prepaid amount of Term Loans			$ 155
Debt amount			260
Term loan facility, due 2023 | Recourse Debt | LIBOR
Debt Instrument [Line Items]
Change in interest rate	0.50%
Basis spread on variable rate	1.75%	1.75%
Term loan facility, due 2023 | Recourse Debt | LIBOR floor
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%
Term loan facility, due 2023 | Senior Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Debt amount			$ 105

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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- Definition

Incremental percentage increase (decrease) in the stated rate on a debt instrument.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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