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Contractholder Funds - Schedule of Account Values by Range of Guaranteed Minimum Credit Rating (Details) $ in Millions	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Policyholder Account Balance
Contractholder funds	$ 59,813	$ 56,404
Indexed annuities
Policyholder Account Balance
Contractholder funds	31,622	30,235	$ 27,164
Indexed annuities | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	25,623	24,718
Indexed annuities | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	1,173	1,239
Indexed annuities | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	1,435	1,176
Indexed annuities | Greater Than 0150
Policyholder Account Balance
Contractholder funds	3,391	3,102
Indexed annuities | 0.00%-1.50%
Policyholder Account Balance
Contractholder funds	27,716	27,114
Indexed annuities | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	24,195	23,540
Indexed annuities | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	1,140	1,236
Indexed annuities | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	477	492
Indexed annuities | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	1,904	1,846
Indexed annuities | 1.51%-2.50%
Policyholder Account Balance
Contractholder funds	3,626	2,802
Indexed annuities | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	1,151	875
Indexed annuities | 1.51%-2.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	31	1
Indexed annuities | 1.51%-2.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	958	684
Indexed annuities | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	1,486	1,242
Indexed annuities | Greater than 2.50%
Policyholder Account Balance
Contractholder funds	280	319
Indexed annuities | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	277	303
Indexed annuities | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	2	2
Indexed annuities | Greater than 2.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	0	0
Indexed annuities | Greater than 2.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	1	14
Fixed rate annuities
Policyholder Account Balance
Contractholder funds	19,270	17,442	13,443
Fixed rate annuities | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	840	865
Fixed rate annuities | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	26	29
Fixed rate annuities | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	746	798
Fixed rate annuities | Greater Than 0150
Policyholder Account Balance
Contractholder funds	17,658	15,750
Fixed rate annuities | 0.00%-1.50%
Policyholder Account Balance
Contractholder funds	16,646	15,257
Fixed rate annuities | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	72	57
Fixed rate annuities | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	18	20
Fixed rate annuities | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	723	773
Fixed rate annuities | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	15,833	14,407
Fixed rate annuities | 1.51%-2.50%
Policyholder Account Balance
Contractholder funds	492	493
Fixed rate annuities | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	4	4
Fixed rate annuities | 1.51%-2.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	6	7
Fixed rate annuities | 1.51%-2.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	18	20
Fixed rate annuities | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	464	462
Fixed rate annuities | Greater than 2.50%
Policyholder Account Balance
Contractholder funds	2,132	1,692
Fixed rate annuities | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	764	804
Fixed rate annuities | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	2	2
Fixed rate annuities | Greater than 2.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	5	5
Fixed rate annuities | Greater than 2.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	1,361	881
Universal Life
Policyholder Account Balance
Contractholder funds	3,044	2,817	$ 2,391
Universal Life | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	3,009	2,785
Universal Life | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	8	7
Universal Life | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	1	1
Universal Life | Greater Than 0150
Policyholder Account Balance
Contractholder funds	26	24
Universal Life | 0.00%-1.50%
Policyholder Account Balance
Contractholder funds	2,684	2,452
Universal Life | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	2,650	2,421
Universal Life | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	8	7
Universal Life | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	0	0
Universal Life | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	26	24
Universal Life | 1.51%-2.50%
Policyholder Account Balance
Contractholder funds	0	0
Universal Life | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	0	0
Universal Life | 1.51%-2.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	0	0
Universal Life | 1.51%-2.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	0	0
Universal Life | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	0	0
Universal Life | Greater than 2.50%
Policyholder Account Balance
Contractholder funds	360	365
Universal Life | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	359	364
Universal Life | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	0	0
Universal Life | Greater than 2.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	1	1
Universal Life | Greater than 2.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	$ 0	$ 0
Minimum | Range from 0001 to 0050
Policyholder Account Balance
Policyholder account balance, above guaranteed minimum crediting rate	0.0001	0.0001
Minimum | Range from 0051 to 0150
Policyholder Account Balance
Policyholder account balance, above guaranteed minimum crediting rate	0.0051	0.0051
Minimum | Greater Than 0150
Policyholder Account Balance
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150
Maximum | Range from 0001 to 0050
Policyholder Account Balance
Policyholder account balance, above guaranteed minimum crediting rate	0.0050	0.0050
Maximum | Range from 0051 to 0150
Policyholder Account Balance
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150

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