Insurance Liabilities - Account balances by guaranteed minimum interest rates (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 101,111	$ 102,937
Account balance percentage	100.00%	100.00%
At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 54,990	$ 66,064
Account balance percentage	55.00%	65.00%
1 Basis Point - 50 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 7,428	$ 5,522
Account balance percentage	7.00%	5.00%
More than 50 Basis Points Above Minimum Guarantee
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 38,693	$ 31,351
Account balance percentage	38.00%	30.00%
Individual Retirement
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 57,137	$ 56,749
Individual Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	35,449	32,629
Individual Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	5,542	6,427
Individual Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	9,029	9,519
Individual Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	6,652	7,676
Individual Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	430	461
Individual Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	35	37
Individual Retirement | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Policyholder Account Balance	25,361	30,595
Individual Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	6,498	8,766
Individual Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	3,749	4,208
Individual Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	8,046	9,502
Individual Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	6,610	7,630
Individual Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	426	456
Individual Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	32	33
Individual Retirement | 1 Basis Point - 50 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder Account Balance	2,148	2,225
Individual Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	2,078	2,161
Individual Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	22	24
Individual Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	11	0
Individual Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	37	40
Individual Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Individual Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Individual Retirement | More than 50 Basis Points Above Minimum Guarantee
Policyholder Account Balance [Line Items]
Policyholder Account Balance	29,628	23,929
Individual Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	26,873	21,702
Individual Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,771	2,195
Individual Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	972	17
Individual Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	5	6
Individual Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	4	5
Individual Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	3	4
Group Retirement
Policyholder Account Balance [Line Items]
Policyholder Account Balance	36,791	38,786
Group Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	11,359	10,647
Group Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	5,644	6,505
Group Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	12,394	13,971
Group Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	615	666
Group Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	6,635	6,843
Group Retirement | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	144	154
Group Retirement | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Policyholder Account Balance	25,383	30,870
Group Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	2,185	3,611
Group Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	3,731	5,628
Group Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	12,073	13,968
Group Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	615	666
Group Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	6,635	6,843
Group Retirement | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	144	154
Group Retirement | 1 Basis Point - 50 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder Account Balance	3,797	2,157
Group Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	2,344	1,427
Group Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,242	727
Group Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	211	3
Group Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Group Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Group Retirement | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Group Retirement | More than 50 Basis Points Above Minimum Guarantee
Policyholder Account Balance [Line Items]
Policyholder Account Balance	7,611	5,759
Group Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	6,830	5,609
Group Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	671	150
Group Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	110	0
Group Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Group Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Group Retirement | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Life Insurance
Policyholder Account Balance [Line Items]
Policyholder Account Balance	7,183	7,402
Life Insurance | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Life Insurance | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	478	482
Life Insurance | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,946	1,979
Life Insurance | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,692	1,744
Life Insurance | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	2,851	2,974
Life Insurance | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	216	223
Life Insurance | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Policyholder Account Balance	4,246	4,599
Life Insurance | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Life Insurance | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	1
Life Insurance | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	9	32
Life Insurance | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,170	1,369
Life Insurance | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	2,851	2,974
Life Insurance | At Guaranteed Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	216	223
Life Insurance | 1 Basis Point - 50 Basis Points Above
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,483	1,140
Life Insurance | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Life Insurance | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	132	129
Life Insurance | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	855	831
Life Insurance | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	496	180
Life Insurance | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Life Insurance | 1 Basis Point - 50 Basis Points Above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Life Insurance | More than 50 Basis Points Above Minimum Guarantee
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,454	1,663
Life Insurance | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range Less Than 1%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Life Insurance | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 1% To 2%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	346	352
Life Insurance | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 2% To 3%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	1,082	1,116
Life Insurance | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 3% To 4%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	26	195
Life Insurance | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 4% To 5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	0	0
Life Insurance | More than 50 Basis Points Above Minimum Guarantee | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From 5% To 5.5%
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 0	$ 0