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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Summary of unrecognized income tax benefits |  |  |
Unrecognized tax benefits balance at beginning of year | $ 37 | $ 54 | $ 49
Additions for tax positions of current year | 6 | 8 | 8
Additions for tax positions of prior years | 1 | 0 | 3
Reductions for tax positions of prior years | 0 | (3) | (1)
Reductions for settlements of tax positions | 0 | (2) | 0
Reductions for lapses in statutes of limitations | (6) | (20) | (5)
Unrecognized tax benefits balance at end of year | $ 38 | $ 37 | $ 54

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI https://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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