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Investments (Securities Lending and Repurchase Agreements Remaining Tenor ) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | $ 12,092 | $ 21,055
U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 10,494 | 20,007
Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 1,344 | 1,047
Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 254 | 0
U.S. corporate |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 1
Open (1) |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 1,945 | 5,901
Open (1) | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 1,945 | 5,900
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
Open (1) | U.S. corporate |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 1
1 Month or Less |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 5,933 | 7,337
1 Month or Less | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 5,448 | 7,052
1 Month or Less | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 422 | 285
1 Month or Less | Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 63 | 0
1 Month or Less | U.S. corporate |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
Over 1 Month to 6 Months |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 4,214 | 7,817
Over 1 Month to 6 Months | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 3,101 | 7,055
Over 1 Month to 6 Months | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 922 | 762
Over 1 Month to 6 Months | Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 191 | 0
Over 1 Month to 6 Months | U.S. corporate |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
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
Over 6 Months to 1 Year | U.S. corporate |  |
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 | 3,125 | 3,325
Repurchase Agreements | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 3,125 | 3,325
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 | 3,125 | 3,325
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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