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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary of unrecognized income tax benefits |  |  |
Unrecognized tax benefits balance at beginning of year | $ 38 | $ 37 | $ 54
Additions for tax positions of current year | 10 | 6 | 8
Additions for tax positions of prior years | 0 | 1 | 0
Reductions for tax positions of prior years | (2) | 0 | (3)
Reductions for settlements of tax positions | 0 | 0 | (2)
Reductions for lapses in statutes of limitations | (6) | (6) | (20)
Unrecognized tax benefits balance at end of year | $ 40 | $ 38 | $ 37

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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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