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Long-Term and Other Debt - Debt Issuance Costs (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Nov. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Debt Disclosure [Abstract] |  |  |  |
Gross financing costs | $ 8 | $ 17 | $ 16 | $ 26

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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