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Long-Term and Other Debt - Gain (Loss) on Debt Financing Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Disclosure [Abstract] |  |  |
Repurchase and cancellation of principal balance at premium | $ 0 | $ 80 | $ 110
Unamortized debt (premium) discount and deferred financing costs. net | 0 | 20 | (30)
Third party debt issuance fees | 1 | 0 | 13
Loss on debt financing transactions | $ 1 | $ 100 | $ 93

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- Definition Repurchase And Cancellation Of Principal Balance At Premium (Discount) + References No definition available. + Details
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- Definition Third Party Debt Issuance Fees + References No definition available. + Details
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- Definition Write Off Of Deferred Debt Issuance Costs And Discount (Premium) + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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