v3.24.1.u1
Separate Account Assets and Liabilities - Separate account assets (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value $ 95,173 $ 91,005
Equity funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 58,765 55,538
Bond funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 8,762 8,676
Balanced funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 25,959 25,166
Money market funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 1,687 1,625
Individual Retirement    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 49,938 47,893
Individual Retirement | Equity funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 26,945 25,451
Individual Retirement | Bond funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 4,121 4,037
Individual Retirement | Balanced funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 18,179 17,711
Individual Retirement | Money market funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 693 694
Group Retirement    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 40,065 38,188
Group Retirement | Equity funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 30,285 28,675
Group Retirement | Bond funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 3,315 3,292
Group Retirement | Balanced funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 5,663 5,479
Group Retirement | Money market funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 802 742
Life Insurance    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 1,016 932
Life Insurance | Equity funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 900 819
Life Insurance | Bond funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 45 44
Life Insurance | Balanced funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 55 53
Life Insurance | Money market funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 16 16
Institutional Markets    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 4,154 3,992
Institutional Markets | Equity funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 635 593
Institutional Markets | Bond funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 1,281 1,303
Institutional Markets | Balanced funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value 2,062 1,923
Institutional Markets | Money market funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets, at fair value $ 176 $ 173