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Investments (Securities Lending and Repurchase Agreements) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | $ 11,089 | $ 10,788
Reinvestment portfolio - estimated fair value | 10,861 | 10,553
Estimated fair value |  |
Securities Financing Transaction [Line Items] |  |
Securities loaned | 10,851 | 10,510
Securities Sold under Agreements to Repurchase | 3,032 | 3,029
Repurchase Agreements |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 2,975 | 2,975
Reinvestment portfolio - estimated fair value | $ 2,912 | $ 2,913

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