Long-Term and Other Debt - Maturities of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt outstanding	$ 8,843
2020	45
2021	386
2021	45
2023	44
2024	4,129
After 2024	4,194
Unamortized deferred financing costs and discount/premium	(118)
Total long-term debt outstanding	8,725	$ 9,037
Senior Notes
Debt Instrument [Line Items]
Total long-term debt outstanding	4,194
2020	0
2021	0
2021	0
2023	0
2024	0
After 2024	4,194
Senior Subordinated Notes
Debt Instrument [Line Items]
Total long-term debt outstanding	341
2020	0
2021	341
2021	0
2023	0
2024	0
After 2024	0
Capital Lease Obligations
Debt Instrument [Line Items]
Total long-term debt outstanding	11
2020	3
2021	3
2021	3
2023	2
2024	0
After 2024	0
Revolver and Term Loans \| Secured Debt
Debt Instrument [Line Items]
Total long-term debt outstanding	4,297
2020	42
2021	42
2021	42
2023	42
2024	4,129
After 2024	$ 0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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)(1)
-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(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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