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Contractholder Funds - Schedule of Account Values by Range of Guaranteed Minimum Credit Rating (Details) $ in Millions	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Policyholder Account Balance [Line Items]
Contractholder funds	$ 57,823	$ 56,404
Indexed annuities
Policyholder Account Balance [Line Items]
Contractholder funds	30,879	30,235	$ 27,164
Indexed annuities | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	25,156	24,718
Indexed annuities | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	1,199	1,239
Indexed annuities | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1,313	1,176
Indexed annuities | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	3,211	3,102
Indexed annuities | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Contractholder funds	27,420	27,114
Indexed annuities | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	23,872	23,540
Indexed annuities | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	1,196	1,236
Indexed annuities | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	485	492
Indexed annuities | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1,867	1,846
Indexed annuities | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	3,147	2,802
Indexed annuities | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	997	875
Indexed annuities | 1.51%-2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	1	1
Indexed annuities | 1.51%-2.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	828	684
Indexed annuities | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1,321	1,242
Indexed annuities | Greater than 2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	312	319
Indexed annuities | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	287	303
Indexed annuities | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	2	2
Indexed annuities | Greater than 2.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Indexed annuities | Greater than 2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	23	14
Fixed rate annuities
Policyholder Account Balance [Line Items]
Contractholder funds	17,885	17,442	13,443
Fixed rate annuities | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	864	865
Fixed rate annuities | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	28	29
Fixed rate annuities | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	761	798
Fixed rate annuities | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	16,232	15,750
Fixed rate annuities | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Contractholder funds	15,626	15,257
Fixed rate annuities | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	72	57
Fixed rate annuities | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	19	20
Fixed rate annuities | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	737	773
Fixed rate annuities | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	14,798	14,407
Fixed rate annuities | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	493	493
Fixed rate annuities | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	4	4
Fixed rate annuities | 1.51%-2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	7	7
Fixed rate annuities | 1.51%-2.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	19	20
Fixed rate annuities | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	463	462
Fixed rate annuities | Greater than 2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	1,766	1,692
Fixed rate annuities | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	788	804
Fixed rate annuities | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	2	2
Fixed rate annuities | Greater than 2.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	5	5
Fixed rate annuities | Greater than 2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	971	881
Universal Life
Policyholder Account Balance [Line Items]
Contractholder funds	2,935	2,817	$ 2,391
Universal Life | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	2,901	2,785
Universal Life | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	7	7
Universal Life | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1	1
Universal Life | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	26	24
Universal Life | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Contractholder funds	2,572	2,452
Universal Life | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	2,539	2,421
Universal Life | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	7	7
Universal Life | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Universal Life | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	26	24
Universal Life | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Universal Life | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Universal Life | 1.51%-2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Universal Life | 1.51%-2.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Universal Life | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Universal Life | Greater than 2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	363	365
Universal Life | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	362	364
Universal Life | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Universal Life | Greater than 2.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1	1
Universal Life | Greater than 2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	$ 0	$ 0
Minimum | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0001	0.0001
Minimum | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0051	0.0051
Minimum | Greater Than 0150
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150
Maximum | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0050	0.0050
Maximum | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0150	0.0150

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Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense.

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