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Notional Amounts of Outstanding Derivative Positions (Detail) € in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 GBP (£) | Sep. 30, 2021 CAD ($) | Sep. 30, 2021 HKD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 HKD ($) | Dec. 31, 2020 USD ($)
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Fixed to Floating Interest Rate Swaps |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 1,000 |  |  |  |  | $ 3,250
Floating to Fixed Interest Rate Swaps |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 28 |  |  |  |  | $ 778
Foreign Exchange Contracts | Euro Member Countries, Euro |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | € | € 4,130 |  |  |  |  | € 4,197 |  |  |  |
Foreign Exchange Contracts | United Kingdom, Pounds |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | £ |  | £ 1,391 |  |  |  |  | £ 1,400 |  |  |
Foreign Exchange Contracts | Canada, Dollars |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 1,623 |  |  |  |  | $ 1,576 |  |
Foreign Exchange Contracts | Hong Kong, Dollars |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 4,103 |  |  |  |  | $ 3,717 |

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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=121590274&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=121590274&loc=SL5579245-113959 + Details
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