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Contractholder Funds - Schedule of Account Values by Range of Guaranteed Minimum Credit Rating (Details) $ in Millions	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Policyholder Account Balance
Contractholder funds	$ 61,798	$ 56,404
Indexed annuities
Policyholder Account Balance
Contractholder funds	4,231	4,004
No guaranteed minimum crediting rate	28,076	26,231
Total	32,307	30,235	$ 27,164
Indexed annuities | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	1,432	1,406
Indexed annuities | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	539	597
Indexed annuities | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	794	622
Indexed annuities | Greater Than 0150
Policyholder Account Balance
Contractholder funds	1,466	1,379
Indexed annuities | Up to 1.50%
Policyholder Account Balance
Contractholder funds	2,332	2,506
Indexed annuities | Up to 1.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	647	721
Indexed annuities | Up to 1.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	523	596
Indexed annuities | Up to 1.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	297	309
Indexed annuities | Up to 1.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	865	880
Indexed annuities | 1.51%-2.50%
Policyholder Account Balance
Contractholder funds	1,676	1,231
Indexed annuities | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	563	432
Indexed annuities | 1.51%-2.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	16	1
Indexed annuities | 1.51%-2.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	497	313
Indexed annuities | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	600	485
Indexed annuities | Greater than 2.50%
Policyholder Account Balance
Contractholder funds	223	267
Indexed annuities | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	222	253
Indexed annuities | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	0	0
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	19,531	17,442
Total	19,531	17,442	13,443
Fixed rate annuities | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	823	865
Fixed rate annuities | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	24	29
Fixed rate annuities | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	907	798
Fixed rate annuities | Greater Than 0150
Policyholder Account Balance
Contractholder funds	17,777	15,750
Fixed rate annuities | Up to 1.50%
Policyholder Account Balance
Contractholder funds	16,812	15,257
Fixed rate annuities | Up to 1.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	73	57
Fixed rate annuities | Up to 1.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	16	20
Fixed rate annuities | Up to 1.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	884	773
Fixed rate annuities | Up to 1.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	15,839	14,407
Fixed rate annuities | 1.51%-2.50%
Policyholder Account Balance
Contractholder funds	494	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	466	462
Fixed rate annuities | Greater than 2.50%
Policyholder Account Balance
Contractholder funds	2,225	1,692
Fixed rate annuities | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	746	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	1,472	881
Universal Life
Policyholder Account Balance
Contractholder funds	3,159	2,817
Total	3,159	2,817	$ 2,391
Universal Life | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	3,120	2,785
Universal Life | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	9	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	29	24
Universal Life | Up to 1.50%
Policyholder Account Balance
Contractholder funds	2,803	2,452
Universal Life | Up to 1.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	2,765	2,421
Universal Life | Up to 1.50% | Range from 0001 to 0050
Policyholder Account Balance
Contractholder funds	9	7
Universal Life | Up to 1.50% | Range from 0051 to 0150
Policyholder Account Balance
Contractholder funds	0	0
Universal Life | Up to 1.50% | Greater Than 0150
Policyholder Account Balance
Contractholder funds	29	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	356	365
Universal Life | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance
Contractholder funds	355	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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