Insurance Liabilities - Policyholder contract deposit (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 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	21,780	17,542
Policy charges	(2,260)	(2,263)
Surrenders and withdrawals	(17,081)	(10,632)
Benefit payments	(6,595)	(5,536)
Net transfers from (to) separate account	5,039	3,290
Interest credited	3,102	2,694
Other	(5)	(46)
Policyholder Contract Deposits Account Balance, end of period	162,474	157,858
Other reconciling items	(2,737)	(3,006)
Legacy insurance lines ceded to Fortitude Re	159,737	154,852	$ 155,984	$ 148,223
Cash surrender value(c)	139,889	138,425
Individual Retirement
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	89,554	84,097
Issuances	12,885	11,359
Policy charges	(661)	(631)
Surrenders and withdrawals	(10,310)	(6,232)
Benefit payments	(2,984)	(2,872)
Net transfers from (to) separate account	2,577	1,606
Interest credited	1,482	1,242
Other	(7)	3
Policyholder Contract Deposits Account Balance, end of period	92,536	88,572
Other reconciling items	(2,280)	(2,372)
Legacy insurance lines ceded to Fortitude Re	$ 90,256	$ 86,200
Weighted average crediting rate	2.65%	2.40%
Cash surrender value(c)	$ 85,644	$ 82,151
Group Retirement
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	43,395	43,902
Issuances	3,943	3,599
Policy charges	(359)	(356)
Surrenders and withdrawals	(6,010)	(4,146)
Benefit payments	(1,801)	(1,634)
Net transfers from (to) separate account	1,896	1,659
Interest credited	843	825
Other	6	1
Policyholder Contract Deposits Account Balance, end of period	41,913	43,850
Other reconciling items	(327)	(356)
Legacy insurance lines ceded to Fortitude Re	$ 41,586	$ 43,494
Weighted average crediting rate	2.88%	2.74%
Cash surrender value(c)	$ 40,928	$ 42,970
Life Insurance
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	10,224	10,183
Issuances	1,211	1,252
Policy charges	(1,143)	(1,175)
Surrenders and withdrawals	(194)	(162)
Benefit payments	(222)	(164)
Net transfers from (to) separate account	1	(1)
Interest credited	297	286
Other	16	(10)
Policyholder Contract Deposits Account Balance, end of period	10,190	10,209
Other reconciling items	11	(125)
Legacy insurance lines ceded to Fortitude Re	$ 10,201	$ 10,084
Weighted average crediting rate	4.37%	4.28%
Cash surrender value(c)	$ 9,008	$ 8,948
Institutional Markets
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	11,734	10,804
Issuances	3,707	1,296
Policy charges	(50)	(52)
Surrenders and withdrawals	(502)	(44)
Benefit payments	(1,355)	(593)
Net transfers from (to) separate account	565	26
Interest credited	353	207
Other	(9)	(48)
Policyholder Contract Deposits Account Balance, end of period	14,443	11,596
Other reconciling items	(20)	(33)
Legacy insurance lines ceded to Fortitude Re	$ 14,423	$ 11,563
Weighted average crediting rate	3.66%	2.49%
Cash surrender value(c)	$ 2,577	$ 2,532
Other Operations before consolidation and eliminations
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance, beginning of year	3,587	3,823
Issuances	34	36
Policy charges	(47)	(49)
Surrenders and withdrawals	(65)	(48)
Benefit payments	(233)	(273)
Net transfers from (to) separate account	0	0
Interest credited	127	134
Other	(11)	8
Policyholder Contract Deposits Account Balance, end of period	3,392	3,631
Other reconciling items	(121)	(120)
Legacy insurance lines ceded to Fortitude Re	$ 3,271	$ 3,511
Weighted average crediting rate	4.99%	4.91%
Cash surrender value(c)	$ 1,732	$ 1,824
Other Operations
Policyholder Account Balance [Roll Forward]
Other reconciling items	$ 121	$ 122