Insurance Liabilities - Policyholder contract deposit (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Jan. 01, 2021
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	$ 158,494	$ 152,809
Issuances	13,934	10,909
Policy charges	(1,529)	(1,503)
Surrenders and withdrawals	(11,149)	(6,896)
Benefit payments	(3,646)	(3,525)
Net transfers from (to) separate account	3,331	2,241
Interest credited	1,908	1,843
Other	(24)	(25)
Policyholder Contract Deposits Account Balance, end of period	161,319	155,853
Other reconciling items	(1,747)	(2,692)
Legacy insurance lines ceded to Fortitude Re	159,572	153,161	$ 155,984	$ 148,223
Cash surrender value(c)	140,260	137,599
Individual Retirement
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	89,554	84,097
Issuances	8,898	7,547
Policy charges	(462)	(395)
Surrenders and withdrawals	(6,585)	(4,008)
Benefit payments	(2,012)	(1,996)
Net transfers from (to) separate account	1,637	1,074
Interest credited	863	882
Other	(3)	6
Policyholder Contract Deposits Account Balance, end of period	91,890	87,207
Other reconciling items	(1,598)	(2,245)
Legacy insurance lines ceded to Fortitude Re	$ 90,292	$ 84,962
Weighted average crediting rate	2.59%	2.38%
Cash surrender value(c)	$ 85,417	$ 81,207
Group Retirement
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	43,395	43,902
Issuances	2,597	2,341
Policy charges	(238)	(259)
Surrenders and withdrawals	(3,979)	(2,726)
Benefit payments	(1,080)	(1,072)
Net transfers from (to) separate account	1,221	1,155
Interest credited	554	550
Other	4	1
Policyholder Contract Deposits Account Balance, end of period	42,474	43,892
Other reconciling items	(254)	(353)
Legacy insurance lines ceded to Fortitude Re	$ 42,220	$ 43,539
Weighted average crediting rate	2.84%	2.72%
Cash surrender value(c)	$ 41,550	$ 43,094
Life Insurance
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	10,224	10,183
Issuances	809	835
Policy charges	(764)	(782)
Surrenders and withdrawals	(122)	(103)
Benefit payments	(100)	(119)
Net transfers from (to) separate account	0	(2)
Interest credited	188	193
Other	(32)	(10)
Policyholder Contract Deposits Account Balance, end of period	10,203	10,195
Other reconciling items	135	(60)
Legacy insurance lines ceded to Fortitude Re	$ 10,338	$ 10,135
Weighted average crediting rate	4.30%	4.25%
Cash surrender value(c)	$ 8,976	$ 8,935
Institutional Markets
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	11,734	10,804
Issuances	1,608	162
Policy charges	(34)	(34)
Surrenders and withdrawals	(421)	(27)
Benefit payments	(283)	(160)
Net transfers from (to) separate account	473	14
Interest credited	218	128
Other	(1)	(29)
Policyholder Contract Deposits Account Balance, end of period	13,294	10,858
Other reconciling items	42	43
Legacy insurance lines ceded to Fortitude Re	$ 13,336	$ 10,901
Weighted average crediting rate	3.54%	2.40%
Cash surrender value(c)	$ 2,555	$ 2,524
Other Operations before consolidation and eliminations
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	3,587	3,823
Issuances	22	24
Policy charges	(31)	(33)
Surrenders and withdrawals	(42)	(32)
Benefit payments	(171)	(178)
Net transfers from (to) separate account	0	0
Interest credited	85	90
Other	8	7
Policyholder Contract Deposits Account Balance, end of period	3,458	3,701
Other reconciling items	(72)	(77)
Legacy insurance lines ceded to Fortitude Re	$ 3,386	$ 3,624
Weighted average crediting rate	4.95%	4.90%
Cash surrender value(c)	$ 1,762	$ 1,839