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Derivative Financial Instruments - Exposure to Credit Loss on Call Options Held (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair Value | $ 977 | $ 546
Not Designated as Hedging Instrument | Call options |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 29,968 | 23,297
Fair Value | 796 | 244
Collateral | 775 | 219
Net Credit Risk | 39 | 33
Not Designated as Hedging Instrument | Call options | Merrill Lynch |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 4,408 | 3,563
Fair Value | 96 | 23
Collateral | 59 | 0
Net Credit Risk | 37 | 23
Not Designated as Hedging Instrument | Call options | Morgan Stanley |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 3,466 | 1,699
Fair Value | 102 | 14
Collateral | 116 | 19
Net Credit Risk | 0 | 0
Not Designated as Hedging Instrument | Call options | Barclay's Bank |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 6,236 | 6,049
Fair Value | 102 | 65
Collateral | 100 | 59
Net Credit Risk | 2 | 6
Not Designated as Hedging Instrument | Call options | Canadian Imperial Bank of Commerce |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 5,983 | 5,169
Fair Value | 147 | 68
Collateral | 148 | 64
Net Credit Risk | 0 | 4
Not Designated as Hedging Instrument | Call options | Wells Fargo |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,443 | 1,361
Fair Value | 58 | 17
Collateral | 60 | 17
Net Credit Risk | 0 | 0
Not Designated as Hedging Instrument | Call options | Goldman Sachs |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,919 | 1,133
Fair Value | 45 | 9
Collateral | 45 | 10
Net Credit Risk | 0 | 0
Not Designated as Hedging Instrument | Call options | Credit Suisse |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 92 | 1,039
Fair Value | 4 | 5
Collateral | 4 | 5
Net Credit Risk | 0 | 0
Not Designated as Hedging Instrument | Call options | Truist |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,759 | 2,489
Fair Value | 124 | 35
Collateral | 124 | 36
Net Credit Risk | 0 | 0
Not Designated as Hedging Instrument | Call options | Citibank |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,073 | 795
Fair Value | 27 | 8
Collateral | 28 | 9
Net Credit Risk | 0 | $ 0
Not Designated as Hedging Instrument | Call options | JP Morgan |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 2,589 |
Fair Value | 91 |
Collateral | 91 |
Net Credit Risk | $ 0 |

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