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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Unrecognized Tax Benefits |  |  |
Unrecognized tax benefits | $ 29 | $ 30 | $ 28
Unrecognized tax benefit, if recognized, would have an impact on effective tax rate | 29 |  |
Activity for unrecognized tax benefits [Roll Forward] |  |  |
Balance at beginning of period | 30 | 28 | 34
Tax positions related to current year additions | 0 | 1 | 1
Additions for tax positions of prior years | 0 | 2 | 0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | (1) | 0 | 0
Reductions due to lapse of statute of limitations on tax positions | 0 | (1) | (7)
Balance at end of period | $ 29 | $ 30 | $ 28

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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 http://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 http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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