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Investments (Securities Lending Remaining Tenor) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | $ 3,692 | $ 3,731
Remaining Tenor of Securities Lending Agreements: Open |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 790 | 642
Remaining Tenor of Securities Lending Agreements: 1 Month or Less |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 1,609 | 2,105
Remaining Tenor of Securities Lending Agreements: 1 to 6 Months |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 1,293 | 984
U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 3,138 | 3,151
U.S. government and agency | Remaining Tenor of Securities Lending Agreements: Open |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 790 | 640
U.S. government and agency | Remaining Tenor of Securities Lending Agreements: 1 Month or Less |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 1,055 | 1,527
U.S. government and agency | Remaining Tenor of Securities Lending Agreements: 1 to 6 Months |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 1,293 | 984
U.S. corporate |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 359 | 412
U.S. corporate | Remaining Tenor of Securities Lending Agreements: Open |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 0 | 2
U.S. corporate | Remaining Tenor of Securities Lending Agreements: 1 Month or Less |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 359 | 410
U.S. corporate | Remaining Tenor of Securities Lending Agreements: 1 to 6 Months |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 0 | 0
Foreign corporate |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 178 | 152
Foreign corporate | Remaining Tenor of Securities Lending Agreements: Open |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 0 | 0
Foreign corporate | Remaining Tenor of Securities Lending Agreements: 1 Month or Less |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 178 | 152
Foreign corporate | Remaining Tenor of Securities Lending Agreements: 1 to 6 Months |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 0 | 0
Foreign Government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 17 | 16
Foreign Government | Remaining Tenor of Securities Lending Agreements: Open |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 0 | 0
Foreign Government | Remaining Tenor of Securities Lending Agreements: 1 Month or Less |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 17 | 16
Foreign Government | Remaining Tenor of Securities Lending Agreements: 1 to 6 Months |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | $ 0 | $ 0

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