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Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred tax valuation allowance, rollfoward |  |  |
Balance at beginning of year | $ 146 |  |
Balance at end of year | 181 | $ 146 |
Deferred tax asset valuation allowance |  |  |
Deferred tax valuation allowance, rollfoward |  |  |
Balance at beginning of year | 146 | 115 | $ 83
Charged to Income tax expense | 35 | 31 | 32
Balance at end of year | $ 181 | $ 146 | $ 115

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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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