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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
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Derivative [Line Items] |  |
Total Derivative Notional Values | $ 7,500,000,000 | $ 7,700,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 400,000,000 | 100,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 5,400,000,000 | 5,400,000,000
Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 1,700,000,000 | 2,200,000,000
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 6,200,000,000 | 6,400,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 400,000,000 | 100,000,000
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 4,100,000,000 | 4,100,000,000
Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 1,700,000,000 | 2,200,000,000
Cross-Currency Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | 1,300,000,000 | 1,300,000,000
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 | 1,300,000,000 | 1,300,000,000
Cross-Currency Interest Rate Swaps [Member] | Trading [Member] |  |
Derivative [Line Items] |  |
Total Derivative Notional Values | $ 0 | $ 0

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