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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Unrecognized tax benefits: |  |  |
Balance, January 1 | $ 227 | $ 173 | $ 190
Increases as a result of tax positions taken during the current year | 26 | 18 | 14
Decreases of tax positions taken during prior years | (20) | (5) | (21)
Increases of tax positions taken during prior years | 40 | 57 | 20
Decreases as a result of settlements with taxing authorities and the expiration of statutes of limitations | (23) | (19) | (30)
Effect of foreign currency rate movements | (5) | 3 | 0
Balance, December 31 | $ 245 | $ 227 | $ 173

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- Definition The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities and lapses of the applicable statutes of limitations. + References No definition available. + Details
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- Definition The impact in unrecognized tax benefits resulting from foreign currency rate movements. + References No definition available. + Details
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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 http://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 http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + 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)(1) -URI http://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 http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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