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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unrecognized tax benefits: |  |  |
Balance, January 1 | $ 190 | $ 214 | $ 201
Increases as a result of tax positions taken during the current year | 14 | 14 | 13
Decreases of tax positions taken during prior years | (21) | (37) | (9)
Increases of tax positions taken during prior years | 20 | 9 | 15
Decreases as a result of settlements with taxing authorities and the expiration of statutes of limitations | (30) | (6) | (15)
Effect of foreign currency rate movements | 0 | (4) | 9
Balance, December 31 | $ 173 | $ 190 | $ 214

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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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + 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=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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