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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Uncertainties [Abstract] |  |  |
Balance at January 1 | $ 1,515 | $ 1,458 | $ 1,225
Additions for tax positions related to the current year | 89 | 106 | 110
Additions for tax positions of prior years | 5 | 23 | 282
Reductions for tax positions of prior years | (141) | (56) | (49)
Settlements | (26) | (16) | (110)
Balance at December 31 | 1,442 | 1,515 | 1,458
Gross interest expense related to unrecognized tax benefits | 62 | 34 | 39
Total accrued interest balance at December 31 | $ 233 | $ 190 | $ 165

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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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