Insurance Liabilities - Income statement information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 2,774	$ 1,363	$ 5,160	$ 2,401
Interest accretion	543	584	1,061	1,073
Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	284	293	593	595
Interest accretion	33	31	62	66
General Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	137	155	232	252
Interest accretion	3	3	4	4
Individual Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	61	57	136	108
Interest accretion	13	10	25	20
Group Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	4	5	10	13
Interest accretion	2	1	5	4
Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	600	586	1,175	1,168
Interest accretion	118	119	236	240
Life Insurance | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	274	284	573	576
Interest accretion	33	31	61	65
Institutional Markets
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	1,919	503	3,500	747
Interest accretion	162	110	301	215
Other Operations before consolidation and eliminations | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	10	9	20	19
Interest accretion	0	0	1	1
Legacy Insurance Lines Segment
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	53	57	107	113
Interest accretion	$ 245	$ 341	$ 490	$ 590