Insurance Liabilities - Income statement information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 2,386	$ 1,038
Interest accretion	518	489
Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	309	302
Interest accretion	29	35
General Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	95	97
Interest accretion	1	1
Individual Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	75	51
Interest accretion	12	10
Group Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	6	8
Interest accretion	3	3
Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	575	582
Interest accretion	118	121
Life Insurance | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	299	292
Interest accretion	28	34
Institutional Markets
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	1,581	244
Interest accretion	139	105
Other Operations before consolidation and eliminations | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	10	10
Interest accretion	1	1
Legacy Insurance Lines Segment
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	54	56
Interest accretion	$ 245	$ 249