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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Unrecognized Tax Benefits |  |  |  |
Unrecognized tax benefits |  | $ 72 | $ 73 | $ 29
Activity for unrecognized tax benefits [Roll Forward] |  |  |  |
Balance at beginning of period | $ 72 | 73 | 29 | 30
Tax positions related to current year additions |  | 2 | 43 | 0
Additions for tax positions of prior years |  | 1 | 1 | 0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  | (4) | 0 | (1)
Balance at end of period |  | $ 72 | $ 73 | $ 29
Forecast |  |  |  |
Activity for unrecognized tax benefits [Roll Forward] |  |  |  |
Reductions due to lapse of statute of limitations on tax positions | (10) |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | $ 10 |  |  |

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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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- 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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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