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Financial Instruments - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Foreign exchange contracts |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | $ 1,655 | $ 1,386
Interest rate caps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | 11,900 | 8,871
Interest rate caps | Subsidiary Issuers |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | 3,000 | 3,100
Interest rate swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | 1,450 | 1,950
Interest rate caps sold |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | 7,200 | 6,000
Purchase |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | $ 4,700 | $ 2,900

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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