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Investments (Securities Lending Remaining Tenor) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | $ 3,191 | $ 3,277
Remaining Tenor of Securities Lending Agreements: Open |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 580 | 647
Remaining Tenor of Securities Lending Agreements: 1 Month or Less |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 1,501 | 1,046
Remaining Tenor of Securities Lending Agreements: 1 to 6 Months |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 1,110 | 1,584
U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 2,802 | 2,886
U.S. government and agency | Remaining Tenor of Securities Lending Agreements: Open |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 580 | 647
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 | 1,112 | 655
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 | 1,110 | 1,584
U.S. corporate |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 250 | 252
U.S. corporate | Remaining Tenor of Securities Lending Agreements: Open |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 0 | 0
U.S. corporate | Remaining Tenor of Securities Lending Agreements: 1 Month or Less |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral received from counterparties | 250 | 252
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 | 124 | 130
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 | 124 | 9
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 | 15 | 9
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 | 15 | 130
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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