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Federal, State, and Local Taxes - Reconciliation of Gross Amounts of Tax Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance, beginning of year | $ 40 | $ 39 | $ 38
Additions for tax positions relating to current-year operations | 1 | 1 | 2
Additions for tax positions relating to prior tax years | 2 | 0 | 1
Subtractions for tax positions relating to prior tax years | (1) | 0 | (2)
Balance, end of year | $ 42 | $ 40 | $ 39

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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