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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument
Long-term debt	$ 6,042	$ 6,691
Recourse Debt
Debt Instrument
Long-term debt	6,008	$ 6,523
Senior Notes due 2026 To 2048 | Recourse Debt
Debt Instrument
Long-term debt	4,400
Senior Secured First Lien Notes due 2024 to 2029 | Recourse Debt
Debt Instrument
Long-term debt	$ 1,100

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No definition available.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Name Accounting Standards Codification
-Topic 942
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