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Policyholder Account Balances - Summary of Range Guaranteed Minimum Crediting Rate (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance $ 15,047 $ 15,540
Policyholder account balance 7,292 [1] 7,661 [2]
At guaranteed minimum    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 5,187 5,533
1–50 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 854 893
51–150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 1,203 1,204
Greater than than 150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 48 31
Less than 2.00%    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 225 [1] 257 [2]
Less than 2.00% | At guaranteed minimum    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 103 121
Less than 2.00% | 1–50 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 69 97
Less than 2.00% | 51–150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 53 39
Less than 2.00% | Greater than than 150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 0 0
2.00%–2.99%    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 909 [1] 1,282 [2]
2.00%–2.99% | At guaranteed minimum    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 807 1,201
2.00%–2.99% | 1–50 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 102 81
2.00%–2.99% | 51–150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 0 0
2.00%–2.99% | Greater than than 150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 0 0
3.00%–3.99%    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 3,735 [1] 3,617 [2]
3.00%–3.99% | At guaranteed minimum    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 1,887 1,732
3.00%–3.99% | 1–50 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 666 699
3.00%–3.99% | 51–150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 1,134 1,155
3.00%–3.99% | Greater than than 150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 48 31
4.00% and greater    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 2,423 [1] 2,505 [2]
4.00% and greater | At guaranteed minimum    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 2,390 2,479
4.00% and greater | 1–50 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 17 16
4.00% and greater | 51–150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance 16 10
4.00% and greater | Greater than than 150 basis points above    
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]    
Policyholder account balance $ 0 $ 0
[1] Excludes universal life insurance and investment contracts of approximately $4,654 million that have a market component to their crediting strategy.
[2] Excludes universal life insurance and investment contracts of approximately $4,807 million that have a market component to their crediting strategy.