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Derivative Financial Instruments - Narrative (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 USD ($) contract counterparty | Dec. 31, 2023 USD ($) contract
Derivative [Line Items] |  |
Number of counterparties, net exposure threshold set to zero | counterparty | 1 |
Counterparties, collateral required threshold | 0.00% |
Other embedded derivatives |  |
Derivative [Line Items] |  |
Term of contract, term one | 1 year |
Term of contract, term two | 2 years |
Term of contract, term three | 3 years |
Term of contract, term five | 5 years |
Term of contract, term six | 6 years |
Call options and interest rate swaps | Derivatives for Trading and Investment | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Collateral posted | $ 1,351 | $ 775
Net Credit Risk | 53 | 39
Call options and interest rate swaps | Cash and Cash Equivalents | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Collateral posted | $ 1,133 | $ 588
Futures contracts |  |
Derivative [Line Items] |  |
Number of instruments held | contract | 392 | 439
Collateral held | $ 5 | $ 4

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