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Income Taxes (Summary of Valuation Allowance) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Balance at beginning of year | $ 2,256 | $ 2,800 | $ 3,097
Additions to valuation allowance charged to income tax expense | 244 | 114 | 429
Reductions to valuation allowance credited to income tax benefit | (1,337) | (6) | (730)
(Reductions) additions to valuation allowance due to NJOY Transaction (no impact to earnings) | (4) | 12 | 0
Reductions to valuation allowance offset to deferred tax asset (no impact to earnings) | (491) | (663) | 0
Foreign currency translation | 0 | (1) | 4
Balance at end of year | $ 668 | $ 2,256 | $ 2,800

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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 (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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