Reinsurance - Summary of the composition of pool of assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Effects of Reinsurance [Line Items]
Bonds available for sale	[1]	$ 226,156	$ 277,202
Fixed maturity securities - fair value option	[1]	4,485	6,278
Loans		50,321	46,677
Investment real estate		2,153	2,727
Short-term investments	[1]	12,376	13,357
Derivative assets net, carrying value		514	843
Derivative assets, net, fair value		6,049	5,761
Other assets	[1]	12,714	14,351
Total assets		526,634	596,112
Carrying Value
Effects of Reinsurance [Line Items]
Short-term investments		6,668	8,931
Other assets		33	32
Hedge Funds and Private Equity Funds
Effects of Reinsurance [Line Items]
Fair Value Using NAV Per Share (or its equivalent)		11,809	10,951
Commercial mortgage loans
Effects of Reinsurance [Line Items]
Loans		37,128	35,665
Policy loans
Effects of Reinsurance [Line Items]
Loans		1,758	1,843
Fortitude Holdings
Effects of Reinsurance [Line Items]
Change in net unrealized gains (losses), gross		(7,500)	(2,200)
Change in net unrealized gains (losses), net of tax		(5,900)	(1,800)
Derivative asset, Fair value of collateral		192	389
Derivative liability, Fair value of collateral		28	10
Fortitude Holdings | Carrying Value
Effects of Reinsurance [Line Items]
Bonds available for sale		18,821	31,815
Fixed maturity securities - fair value option		4,182	1,983
Investment real estate		133	201
Short-term investments		75	50
Funds withheld investment assets		29,566	39,672
Derivative assets net, carrying value		90	81
Other assets		782	602
Total assets		30,438	40,355
Fortitude Holdings | Estimated Fair Value
Effects of Reinsurance [Line Items]
Bonds available for sale		18,821	31,815
Fixed maturity securities - fair value option		4,182	1,983
Investment real estate		348	395
Short-term investments		75	50
Funds withheld investment assets		29,511	40,088
Derivative assets, net, fair value		90	81
Other assets		782	602
Total		30,383	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)		1,893	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)		1,893	1,606
Fortitude Holdings | Commercial mortgage loans | Carrying Value
Effects of Reinsurance [Line Items]
Loans		4,107	3,637
Fortitude Holdings | Commercial mortgage loans | Estimated Fair Value
Effects of Reinsurance [Line Items]
Loans, fair value		3,837	3,859
Fortitude Holdings | Policy loans | Carrying Value
Effects of Reinsurance [Line Items]
Loans		355	380
Fortitude Holdings | Policy loans | Estimated Fair Value
Effects of Reinsurance [Line Items]
Loans, fair value		$ 355	$ 380

[1] See Note 9 for details of balances associated with variable interest entities.