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Condensed Financial Information (Parent Company) (Loans to Subsidiaries - Narrative) (Details) - Parent Company - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Mar. 31, 2021
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract] |  |  |  |  |
Due from Affiliate, Current | $ 60 | $ 35 |  | $ 150 | $ 195
Interest Income [Member] |  |  |  |  |
Notes to Condensed Financial Information of Parent Company (Textuals) [Abstract] |  |  |  |  |
Revenue from Related Parties | $ 2 | $ 1 | $ 2 |  |

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- Definition Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124433192&loc=d3e56071-112765 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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