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Income Taxes - Reconciliation of Liabilities Associated with Uncertain Tax Provisions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Balance at beginning of year | $ 1,271 | $ 1,301 | $ 1,433
Additions based on tax positions related to the current year | 38 | 76 | 86
Additions for tax positions of prior years | 19 | 78 | 65
Impact of changes in exchange rates | (24) | (3) | 2
Settlements with tax authorities | (49) | (15) | (50)
Reductions for tax positions of prior years | (228) | (87) | (176)
Reductions due to the lapse of the applicable statute of limitations | (26) | (79) | (59)
Balance at end of year | $ 1,001 | $ 1,271 | $ 1,301

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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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