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Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities by Sector) (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | $ 11,735 | $ 8,061
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | $ 692 | $ 585
Fixed maturity securities in continuous unrealized loss position, less than 12 months, number of securities | 1,825 | 1,347
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | $ 49,262 | $ 51,758
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | $ 7,086 | $ 6,571
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, number of securities | 6,712 | 7,038
U.S. corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | $ 6,092 | $ 4,554
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 479 | 409
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 22,465 | 22,796
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 3,294 | 2,987
Foreign corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 1,683 | 1,010
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 87 | 73
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 8,111 | 8,311
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 1,334 | 1,216
U.S. government and agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 1,158 | 518
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 30 | 9
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 2,901 | 3,477
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 556 | 514
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 709 | 413
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 21 | 20
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 5,616 | 5,774
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 893 | 792
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 367 | 411
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 28 | 33
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 5,754 | 5,786
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 524 | 581
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 1,057 | 572
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 5 | 3
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 2,111 | 3,360
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 104 | 128
State and political subdivision |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 608 | 471
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 41 | 32
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 1,639 | 1,634
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 284 | 272
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 61 | 112
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 1 | 6
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 665 | 620
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | $ 97 | $ 81

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