Policyholder Account Balances - Summary of Range Guaranteed Minimum Crediting Rate (Parenthetical) (Detail) $ in Millions	Jun. 30, 2023 USD ($) bps		Dec. 31, 2022 USD ($) bps
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 15,922		$ 16,564
1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	838		830
51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 1,186		$ 1,159
Greater than than 150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate | bps	150		150
Policyholder account balances	$ 5		$ 1
Minimum | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate | bps	1		1
Minimum | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate | bps	51		51
Maximum | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate | bps	50		50
Maximum | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate | bps	150		150
Less than 2.00%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 715	[1]	$ 1,109	[2]
Less than 2.00% | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	92		42
Less than 2.00% | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	5		2
Less than 2.00% | Greater than than 150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 0		$ 0
Less than 2.00% | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	2.00%		2.00%
2.00%–2.99%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 1,040	[1]	$ 949	[2]
2.00%–2.99% | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	2		2
2.00%–2.99% | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	0		0
2.00%–2.99% | Greater than than 150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 0		$ 0
2.00%–2.99% | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	2.00%		2.00%
2.00%–2.99% | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	2.99%		2.99%
3.00%–3.99%
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 3,736	[1]	$ 3,859	[2]
3.00%–3.99% | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	728		774
3.00%–3.99% | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	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 balances	$ 5		$ 1
3.00%–3.99% | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	3.00%		3.00%
3.00%–3.99% | Maximum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	3.99%		3.99%
4.00% and greater
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 2,577	[1]	$ 2,662	[2]
4.00% and greater | 1–50 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	16		12
4.00% and greater | 51–150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	4		1
4.00% and greater | Greater than than 150 basis points above
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 0		$ 0
4.00% and greater | Minimum
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	4.00%		4.00%
Investment Contracts Market Component
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]
Policyholder account balances	$ 5,016		$ 5,202

[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.