Reinsurance - Summary of the composition of pool of assets (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Bonds available for sale	[1]	$ 219,767		$ 277,202
Fixed maturity securities - fair value option	[1]	7,131		6,278
Loans		48,779		46,677
Investment real estate		2,205		2,727
Short-term investments	[1]	14,663		13,357
Derivative assets net, carrying value		393		843
Derivative assets, net, fair value		6,744		5,761
Other assets	[1]	12,868		14,351
Total assets		522,932		596,112
Carrying Value
Effects of Reinsurance [Line Items]
Short-term investments		9,319		8,931
Other assets		69		32
Hedge Funds and Private Equity Funds
Effects of Reinsurance [Line Items]
Fair Value Using NAV Per Share (or its equivalent)		11,625		10,951
Commercial mortgage loans
Effects of Reinsurance [Line Items]
Loans		35,824		35,665
Policy loans
Effects of Reinsurance [Line Items]
Loans		1,773		1,843
Fortitude Holdings
Effects of Reinsurance [Line Items]
Change in net unrealized gains (losses), gross		(7,700)	$ (2,100)
Change in net unrealized gains (losses), net of tax		(6,100)	$ (1,600)
Derivative asset, Fair value of collateral		366		389
Derivative liability, Fair value of collateral		19		10
Fortitude Holdings | Carrying Value
Effects of Reinsurance [Line Items]
Bonds available for sale		19,247		31,815
Fixed maturity securities - fair value option		3,800		1,983
Investment real estate		139		201
Short-term investments		160		50
Funds withheld investment assets		29,640		39,672
Derivative assets net, carrying value		97		81
Other assets		708		602
Total assets		30,445		40,355
Fortitude Holdings | Estimated Fair Value
Effects of Reinsurance [Line Items]
Bonds available for sale		19,247		31,815
Fixed maturity securities - fair value option		3,800		1,983
Investment real estate		364		395
Short-term investments		160		50
Funds withheld investment assets		29,619		40,088
Derivative assets, net, fair value		97		81
Other assets		708		602
Total		30,424		40,771
Fortitude Holdings | Hedge Funds and Private Equity Funds | Carrying Value
Effects of Reinsurance [Line Items]
Fair Value Using NAV Per Share (or its equivalent)		1,861		1,606
Fortitude Holdings | Hedge Funds and Private Equity Funds | Estimated Fair Value
Effects of Reinsurance [Line Items]
Fair Value Using NAV Per Share (or its equivalent)		1,861		1,606
Fortitude Holdings | Commercial mortgage loans | Carrying Value
Effects of Reinsurance [Line Items]
Loans		4,076		3,637
Fortitude Holdings | Commercial mortgage loans | Estimated Fair Value
Effects of Reinsurance [Line Items]
Loans, fair value		3,830		3,859
Fortitude Holdings | Policy loans | Carrying Value
Effects of Reinsurance [Line Items]
Loans		357		380
Fortitude Holdings | Policy loans | Estimated Fair Value
Effects of Reinsurance [Line Items]
Loans, fair value		$ 357		$ 380

[1] See Note 8 for details of balances associated with variable interest entities.