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Investments (Securities Lending and Repurchase Agreements Remaining Tenor) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | $ 12,520 | $ 11,404
U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 11,104 | 10,062
Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 1,256 | 1,170
Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 160 | 172
Open (1) |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 2,823 | 2,987
Open (1) | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 2,823 | 2,987
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 | 4,382 | 5,771
1 Month or Less | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 3,485 | 4,986
1 Month or Less | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 798 | 677
1 Month or Less | Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 99 | 108
Over 1 Month to 6 Months |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 5,315 | 2,646
Over 1 Month to 6 Months | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 4,796 | 2,089
Over 1 Month to 6 Months | Foreign government |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 458 | 493
Over 1 Month to 6 Months | Agency RMBS |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 61 | 64
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 | 2,925 | 2,975
Repurchase Agreements | U.S. government and agency |  |
Securities Financing Transaction [Line Items] |  |
Cash collateral on deposit from counterparties | 2,925 | 2,975
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 | 2,925 | 2,975
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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