Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Account Values by Comparison of Current Crediting Rate to Guaranteed Minimum Crediting Rate (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Policyholder Account Balance [Line Items]
Total	$ 888	$ 879
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Less than 3.00%
Policyholder Account Balance [Line Items]
Total	0	0
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.00% to 0349
Policyholder Account Balance [Line Items]
Total	30	16
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.50% to 3.99%
Policyholder Account Balance [Line Items]
Total	11	12
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.00% to 4.49%
Policyholder Account Balance [Line Items]
Total	434	429
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.50% to 4.99%
Policyholder Account Balance [Line Items]
Total	262	267
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 5.00% or greater
Policyholder Account Balance [Line Items]
Total	67	69
Non-account balances
Policyholder Account Balance [Line Items]
Total	84	86
At guaranteed minimum
Policyholder Account Balance [Line Items]
Total	774	777
At guaranteed minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Less than 3.00%
Policyholder Account Balance [Line Items]
Total	0	0
At guaranteed minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.00% to 0349
Policyholder Account Balance [Line Items]
Total	0	0
At guaranteed minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.50% to 3.99%
Policyholder Account Balance [Line Items]
Total	11	12
At guaranteed minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.00% to 4.49%
Policyholder Account Balance [Line Items]
Total	434	429
At guaranteed minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.50% to 4.99%
Policyholder Account Balance [Line Items]
Total	262	267
At guaranteed minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 5.00% or greater
Policyholder Account Balance [Line Items]
Total	67	69
At guaranteed minimum | Non-account balances
Policyholder Account Balance [Line Items]
Total
1-50 basis points above
Policyholder Account Balance [Line Items]
Total	30	16
1-50 basis points above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Less than 3.00%
Policyholder Account Balance [Line Items]
Total	0	0
1-50 basis points above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.00% to 0349
Policyholder Account Balance [Line Items]
Total	30	16
1-50 basis points above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.50% to 3.99%
Policyholder Account Balance [Line Items]
Total	0	0
1-50 basis points above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.00% to 4.49%
Policyholder Account Balance [Line Items]
Total	0	0
1-50 basis points above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.50% to 4.99%
Policyholder Account Balance [Line Items]
Total	0	0
1-50 basis points above | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 5.00% or greater
Policyholder Account Balance [Line Items]
Total	0	0
1-50 basis points above | Non-account balances
Policyholder Account Balance [Line Items]
Total
Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.00% to 0349
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0300	0.0300
Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.50% to 3.99%
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0350	0.0350
Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.00% to 4.49%
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0400	0.0400
Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.50% to 4.99%
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0450	0.0450
Minimum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 5.00% or greater
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0500	0.0500
Minimum | 1-50 basis points above
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0001
Maximum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range From Less than 3.00%
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0300	0.0300
Maximum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.00% to 0349
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0349	0.0349
Maximum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 3.50% to 3.99%
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0399	0.0399
Maximum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.00% to 4.49%
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0449	0.0449
Maximum | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 4.50% to 4.99%
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0499	0.0499
Maximum | 1-50 basis points above
Policyholder Account Balance [Line Items]
Policyholder account balance, above guaranteed minimum crediting rate	0.0050