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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Derivative [Line Items] |  |
Total Derivative Notional Values | $ 10,300,000,000 | $ 39,700,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 2,200,000,000 | 8,300,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 6,200,000,000 | 8,000,000,000
Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 1,900,000,000 | 23,400,000,000
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 8,700,000,000 | 31,900,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 2,200,000,000 | 8,300,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 4,600,000,000 | 6,200,000,000
Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 1,900,000,000 | 17,400,000,000
Floor Income Contracts [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 0 | 6,000,000,000
Floor Income Contracts [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 0 | 0
Floor Income Contracts [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 0 | 0
Floor Income Contracts [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 0 | 6,000,000,000
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 1,600,000,000 | 1,800,000,000
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 0 | 0
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 1,600,000,000 | 1,800,000,000
Cross-Currency Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | $ 0 | $ 0

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