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Investments (Securities Lending and Repurchase Agreements Remaining Tenor ) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | $ 10,788 | $ 12,092
U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 9,418 | 10,494
Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 1,107 | 1,344
Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 263 | 254
Open (1) |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 1,393 | 1,945
Open (1) | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 1,393 | 1,945
Open (1) | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
Open (1) | Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
1 Month or Less |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 4,677 | 5,933
1 Month or Less | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 4,106 | 5,448
1 Month or Less | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 483 | 422
1 Month or Less | Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 88 | 63
Over 1 Month to 6 Months |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 4,718 | 4,214
Over 1 Month to 6 Months | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 3,919 | 3,101
Over 1 Month to 6 Months | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 624 | 922
Over 1 Month to 6 Months | Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 175 | 191
Over 6 Months to 1 Year |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
Over 6 Months to 1 Year | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
Over 6 Months to 1 Year | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
Over 6 Months to 1 Year | Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
Repurchase Agreements |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 2,975 | 3,125
Repurchase Agreements | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 2,975 | 3,125
Repurchase Agreements | Open (1) | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
Repurchase Agreements | 1 Month or Less | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 2,975 | 3,125
Repurchase Agreements | Over 1 Month to 6 Months | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
Repurchase Agreements | Over 6 Months to 1 Year | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | $ 0 | $ 0

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