Insurance Liabilities - Income statement information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 8,944	$ 6,236	$ 7,127
Interest accretion	2,190	2,183	1,954
Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	1,146	1,232	1,226
Interest accretion	134	128	138
General Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	477	487	547
Interest accretion	9	8	7
Individual Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	202	224	186
Interest accretion	55	42	41
Group Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	19	19	21
Interest accretion	11	10	11
Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	2,393	2,342	2,319
Interest accretion	471	479	484
Life Insurance | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	1,109	1,193	1,187
Interest accretion	132	126	136
Institutional Markets
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	5,638	2,940	3,818
Interest accretion	664	459	380
Corporate and Other [Member] | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	37	39	39
Interest accretion	2	2	2
Legacy Insurance Lines Segment
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	215	224	236
Interest accretion	$ 980	$ 1,185	$ 1,031