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Investments (Securities Pledged) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total securities pledged | $ 23,868 | $ 25,049
Total liabilities supported by the pledged collateral | 14,067 | 15,421
Fixed maturities |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total securities pledged | 21,187 | 21,339
Separate account assets |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total securities pledged | 1,468 | 2,606
Equity securities |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total securities pledged | 827 | 719
Other |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total securities pledged | 336 | 355
Securities sold under agreements to repurchase |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total liabilities supported by the pledged collateral | 6,056 | 6,589
Cash collateral for loaned securities |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total liabilities supported by the pledged collateral | 6,477 | 6,100
Separate account liabilities |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total liabilities supported by the pledged collateral | 1,507 | 2,703
Long-term Debt |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total liabilities supported by the pledged collateral | 27 | 29
Trading | Fixed maturities |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Total securities pledged | $ 50 | $ 30

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