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Investments (Securities Lending and Repurchase Agreements Remaining Tenor) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | $ 13,748 | $ 21,055
U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 12,634 | 20,007
Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 918 | 1,047
RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 196 | 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 | 2,643 | 5,901
Open (1) | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 2,643 | 5,900
Open (1) | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 0 | 0
Open (1) | 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 | 7,364 | 7,337
1 Month or Less | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 7,017 | 7,052
1 Month or Less | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 206 | 285
1 Month or Less | RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 141 | 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 | 3,741 | 7,817
Over 1 Month to 6 Months | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 2,974 | 7,055
Over 1 Month to 6 Months | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 712 | 762
Over 1 Month to 6 Months | RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 55 | 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 | 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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