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Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred tax valuation allowance, rollfoward |  |  |
Balance at beginning of year | $ 177 |  |
Balance at end of year | 216 | $ 177 |
Deferred tax asset valuation allowance |  |  |
Deferred tax valuation allowance, rollfoward |  |  |
Balance at beginning of year | 177 | 149 | $ 158
Charged to Income tax expense | 39 | 28 | (9)
Balance at end of year | $ 216 | $ 177 | $ 149

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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