Policyholder Account Balances - Summary of Range Guaranteed Minimum Crediting Rate (Detail) - USD ($) $ in Millions	Jun. 30, 2023		Dec. 31, 2022
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	$ 15,922		$ 16,564
Policyholder account balance	8,068	[1]	8,579	[2]
At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	6,039		6,589
1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	838		830
51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	1,186		1,159
Greater than than 150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	5		1
Less than 2.00%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	715	[1]	1,109	[2]
Less than 2.00% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	618		1,065
Less than 2.00% | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	92		42
Less than 2.00% | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	5		2
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	1,040	[1]	949	[2]
2.00%–2.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	1,038		947
2.00%–2.99% | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	2		2
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	3,736	[1]	3,859	[2]
3.00%–3.99% | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	1,826		1,928
3.00%–3.99% | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	728		774
3.00%–3.99% | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	1,177		1,156
3.00%–3.99% | Greater than than 150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	5		1
4.00% and greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	2,577	[1]	2,662	[2]
4.00% and greater | At guaranteed minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	2,557		2,649
4.00% and greater | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	16		12
4.00% and greater | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balance	4		1
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 investment contracts of approximately $5,016 million that have a market component to their crediting strategy.

[2] Excludes investment contracts of approximately $5,202 million that have a market component to their crediting strategy.