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Contractholder Funds - Account Values by Range of Guaranteed Minimum Credit Rating (Details) $ in Millions	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Policyholder Account Balance [Line Items]
Contractholder funds	$ 53,602	$ 48,798
Indexed Annuity
Policyholder Account Balance [Line Items]
Contractholder funds	28,570	27,164	$ 24,766
Indexed Annuity | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	23,763	22,965
Indexed Annuity | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	1,339	1,446
Indexed Annuity | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	767	550
Indexed Annuity | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	2,701	2,203
Indexed Annuity | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Contractholder funds	26,648	26,315
Indexed Annuity | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	22,909	22,392
Indexed Annuity | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	1,336	1,444
Indexed Annuity | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	512	526
Indexed Annuity | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1,891	1,953
Indexed Annuity | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	1,587	471
Indexed Annuity | 1.51%-2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	521	196
Indexed Annuity | 1.51%-2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	1	1
Indexed Annuity | 1.51%-2.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	255	24
Indexed Annuity | 1.51%-2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	810	250
Indexed Annuity | Greater than 2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	335	378
Indexed Annuity | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	333	377
Indexed Annuity | Greater than 2.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	2	1
Indexed Annuity | Greater than 2.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Indexed Annuity | Greater than 2.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	0	0
Fixed Rate Annuities
Policyholder Account Balance [Line Items]
Contractholder funds	15,542	13,443	9,358
Fixed Rate Annuities | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	888	921
Fixed Rate Annuities | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	31	35
Fixed Rate Annuities | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1,146	1,559
Fixed Rate Annuities | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	13,477	10,928
Fixed Rate Annuities | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Contractholder funds	13,585	11,851
Fixed Rate Annuities | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	35	23
Fixed Rate Annuities | 0.00%-1.50% | Range from 0001 to 0050
Policyholder Account Balance [Line Items]
Contractholder funds	22	25
Fixed Rate Annuities | 0.00%-1.50% | Range from 0051 to 0150
Policyholder Account Balance [Line Items]
Contractholder funds	1,123	1,532
Fixed Rate Annuities | 0.00%-1.50% | Greater Than 0150
Policyholder Account Balance [Line Items]
Contractholder funds	12,405	10,271
Fixed Rate Annuities | 1.51%-2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	488	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	457	453
Fixed Rate Annuities | Greater than 2.50%
Policyholder Account Balance [Line Items]
Contractholder funds	1,469	1,103
Fixed Rate Annuities | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	849	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	615	204
Universal Life
Policyholder Account Balance [Line Items]
Contractholder funds	2,587	2,391	$ 2,112
Universal Life | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	2,557	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	23	21
Universal Life | 0.00%-1.50%
Policyholder Account Balance [Line Items]
Contractholder funds	2,214	2,013
Universal Life | 0.00%-1.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	2,185	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	23	21
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	373	378
Universal Life | Greater than 2.50% | At Guaranteed Minimum
Policyholder Account Balance [Line Items]
Contractholder funds	372	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

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- Definition

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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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