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Investments (Continuous Gross Unrealized Losses for Fixed Maturity Securities by Sector) (Details) $ in Millions | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | $ 32,294 | $ 52,375
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | $ 2,517 | $ 6,644
Fixed maturity securities in continuous unrealized loss position, less than 12 months, number of securities | 4,595 | 7,309
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | $ 30,336 | $ 11,944
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | $ 5,616 | $ 2,868
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, number of securities | 4,746 | 2,049
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 | $ 15,735 | $ 24,509
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 1,324 | 3,351
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 12,122 | 3,979
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 2,555 | 1,170
Foreign corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 4,986 | 8,260
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 423 | 1,413
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 4,828 | 1,601
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 1,215 | 519
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 | 1,515 | 3,121
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 119 | 265
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 2,266 | 1,147
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 376 | 337
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 3,017 | 4,731
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 209 | 497
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 3,942 | 2,246
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 602 | 448
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 3,582 | 5,589
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 265 | 543
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 3,041 | 970
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 401 | 167
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 | 1,223 | 2,041
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 100 | 317
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 789 | 247
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 201 | 83
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 1,828 | 3,347
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 50 | 159
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 2,980 | 1,733
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | 198 | 137
Foreign Government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturity securities in continuous unrealized loss position, less than 12 months, estimated fair value | 408 | 777
Fixed maturity securities in continuous unrealized loss position, less than 12 months, gross unrealized losses | 27 | 99
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, estimated fair value | 368 | 21
Fixed maturity securities in continuous unrealized loss position, 12 months or greater, gross unrealized losses | $ 68 | $ 7

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