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Contractholder Funds - Schedule of Account Values by Range of Guaranteed Minimum Credit Rating (Details) $ in Millions	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Policyholder Account Balance [Line Items]
Contractholder funds	$ 55,468	$ 48,798
Indexed annuities
Policyholder Account Balance [Line Items]
Contractholder funds	29,256	27,164	$ 24,766
Indexed annuities | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	24,112	22,965
Indexed annuities | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	1,288	1,446
Indexed annuities | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	962	550
Indexed annuities | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	2,894	2,203
Indexed annuities | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Contractholder funds	26,729	26,315
Indexed annuities | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	23,095	22,392
Indexed annuities | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	1,285	1,444
Indexed annuities | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	502	526
Indexed annuities | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1,847	1,953
Indexed annuities | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	2,207	471
Indexed annuities | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	700	196
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	460	24
Indexed annuities | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1,046	250
Indexed annuities | Greater than 2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	320	378
Indexed annuities | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	317	377
Indexed annuities | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	2	1
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	1	0
Fixed rate annuities
Policyholder Account Balance [Line Items]
Contractholder funds	16,979	13,443	9,358
Fixed rate annuities | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	876	921
Fixed rate annuities | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	30	35
Fixed rate annuities | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	948	1,559
Fixed rate annuities | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	15,125	10,928
Fixed rate annuities | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Contractholder funds	14,847	11,851
Fixed rate annuities | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	46	23
Fixed rate annuities | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	21	25
Fixed rate annuities | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	925	1,532
Fixed rate annuities | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	13,855	10,271
Fixed rate annuities | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	491	489
Fixed rate annuities | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	4	5
Fixed rate annuities | 1.51%-2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	7	8
Fixed rate annuities | 1.51%-2.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	20	23
Fixed rate annuities | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	460	453
Fixed rate annuities | Greater than 2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	1,641	1,103
Fixed rate annuities | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	826	893
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	3	4
Fixed rate annuities | Greater than 2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	810	204
Universal Life
Policyholder Account Balance [Line Items]
Contractholder funds	2,698	2,391	$ 2,112
Universal Life | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	2,669	2,348
Universal Life | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	6	21
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	22	21
Universal Life | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Contractholder funds	2,331	2,013
Universal Life | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	2,303	1,987
Universal Life | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	6	5
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	22	21
Universal Life | Greater than 2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	367	378
Universal Life | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	366	361
Universal Life | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	0	16
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

X

- Definition

Value above guaranteed minimum crediting rate on policyholder account balance.

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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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