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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Derivative [Line Items] |  |
Total Derivative Notional Values | $ 69,600,000,000 | $ 71,700,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 16,400,000,000 | 16,700,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 9,500,000,000 | 11,200,000,000
Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 43,700,000,000 | 43,800,000,000
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 54,900,000,000 | 51,000,000,000.0
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 16,400,000,000 | 16,700,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 7,300,000,000 | 7,500,000,000
Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 31,200,000,000 | 26,800,000,000
Floor Income Contracts [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 12,500,000,000 | 17,000,000,000.0
Floor Income Contracts [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 12,500,000,000 | 17,000,000,000.0
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 2,200,000,000 | 3,700,000,000
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | $ 2,200,000,000 | $ 3,700,000,000

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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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