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Investments (Securities Lending) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | $ 3,191 | $ 3,277
Reinvestment portfolio — estimated fair value | 3,159 | 3,246
Amortized cost |  |
Securities Financing Transaction [Line Items] |  |
Securities on loan | 3,441 | 3,420
Estimated fair value |  |
Securities Financing Transaction [Line Items] |  |
Securities on loan | $ 3,120 | $ 3,194

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