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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Uncertainties [Abstract] |  |  |  |
Balance at January 1 |  | $ 1,458 | $ 1,225 | $ 1,347
Additions for tax positions related to the current year |  | 106 | 110 | 125
Additions for tax positions of prior years |  | 23 | 282 | 323
Reductions for tax positions of prior years |  | (56) | (49) | (83)
Settlements |  | (16) | (110) | (48)
Separation of Carrier and Otis | $ (439) | 0 | 0 | (439)
Balance at December 31 |  | 1,515 | 1,458 | 1,225
Gross interest expense related to unrecognized tax benefits |  | 34 | 39 | 50
Total accrued interest balance at December 31 | $ 165 | $ 190 | $ 165 | $ 141

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI https://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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