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Notional Amounts of Outstanding Derivative Positions (Detail) € in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions | Sep. 30, 2020 EUR (€) | Sep. 30, 2020 GBP (£) | Sep. 30, 2020 CAD ($) | Sep. 30, 2020 HKD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 GBP (£) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 HKD ($) | Dec. 31, 2019 USD ($)
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | € 3,711 | £ 1,345 | $ 1,269 | $ 3,479 |  | € 4,571 | £ 1,494 | $ 1,402 | $ 3,327 |
Fixed to Floating Interest Rate Swaps |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 3,250 |  |  |  |  | $ 3,674
Floating to Fixed Interest Rate Swaps |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 778 |  |  |  |  | $ 778

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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=109980867&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=109980867&loc=SL5579245-113959 + Details
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