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Income Taxes (Summary of Valuation Allowance) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Balance at beginning of year | $ 3,097 | $ 2,817 | $ 2,324
Additions to valuation allowance charged to income tax expense | 429 | 401 | 692
Reductions to valuation allowance credited to income tax benefit | (730) | (118) | (200)
Foreign currency translation | 4 | (3) | 1
Balance at end of year | $ 2,800 | $ 3,097 | $ 2,817

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- Definition Valuation Allowance, Deferred Tax Asset, Reductions + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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