Reinsurance - Summary of the Composition of Pool of Assets (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Effects of Reinsurance [Line Items]
Bonds available for sale	[1]	$ 232,487		$ 231,733
Fixed maturity securities - fair value option	[1]	5,403		5,241
Real estate investments		2,159		2,237
Private equity funds / hedge funds		11,195		11,320
Short-term investments	[1]	15,077		17,200
Other assets	[1]	12,313		13,089
Total assets		544,121		539,306
Carrying Value
Effects of Reinsurance [Line Items]
Short-term investments		6,590		6,428
Other assets		43		45
Commercial mortgage loans
Effects of Reinsurance [Line Items]
Loans		38,478		38,009
Policy loans
Effects of Reinsurance [Line Items]
Loans		1,753		1,753
Fortitude Holdings
Effects of Reinsurance [Line Items]
Change in net unrealized gains (losses), gross		(163)	$ 704
Change in net unrealized gains (losses), net of tax		(128)	$ 556
Derivative asset, Fair value of collateral		17		63
Derivative liability, Fair value of collateral		27		34
Fortitude Holdings | Carrying Value
Effects of Reinsurance [Line Items]
Bonds available for sale		16,726		17,384
Fixed maturity securities - fair value option		5,035		4,867
Real estate investments		175		184
Private equity funds / hedge funds		1,920		1,910
Short-term investments		178		176
Funds withheld investment assets		28,241		28,772
Derivative assets, net		14		45
Other assets		675		758
Total assets		28,930		29,575
Fortitude Holdings | Estimated Fair Value
Effects of Reinsurance [Line Items]
Bonds available for sale		16,726		17,384
Fixed maturity securities - fair value option		5,035		4,867
Real estate investments		302		329
Private equity funds / hedge funds		1,920		1,910
Short-term investments		178		176
Funds withheld investment assets		28,100		28,681
Derivative assets, net		14		45
Other assets, fair value		675		758
Total		28,789		29,484
Fortitude Holdings | Commercial mortgage loans | Carrying Value
Effects of Reinsurance [Line Items]
Loans		3,882		3,921
Fortitude Holdings | Commercial mortgage loans | Estimated Fair Value
Effects of Reinsurance [Line Items]
Loans, fair value		3,614		3,685
Fortitude Holdings | Policy loans | Carrying Value
Effects of Reinsurance [Line Items]
Loans		325		330
Fortitude Holdings | Policy loans | Estimated Fair Value
Effects of Reinsurance [Line Items]
Loans, fair value		$ 325		$ 330

[1] See Note 10 for details of balances associated with variable interest entities.