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Income Tax (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at January 1, | $ 129 | $ 163 | $ 272
Additions for tax positions of prior years | 27 | 42 | 19
Reductions for tax positions of prior years (1) | (30) | (93) | (112)
Additions for tax positions of current year | 5 | 22 | 5
Reductions for tax positions of current year | 0 | (3) | (18)
Settlements with tax authorities | 0 | (2) | (3)
Balance at December 31, | 131 | 129 | 163
Unrecognized tax benefits that, if recognized, would impact the effective rate | $ 90 | $ 80 | $ 103

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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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