Additional Information about Derivative Assets and Liabilities Subject to Enforceable Master Netting Arrangement (Detail) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Gross amounts recognized, derivatives assets		$ 38	$ 50
Gross amounts recognized, derivatives liabilities		1,101	739
Subject to enforceable master netting arrangement
Derivative [Line Items]
Gross amounts recognized, net derivatives		(875)	(472)
Gross amounts offset in the balance sheet, net derivatives		0	0
Net amounts presented in the balance sheet, net derivatives		(875)	(472)
Gross amounts not offset in the balance sheet, financial instruments, net derivatives	[1]	0	0
Collateral received		(15)	(21)
Collateral pledged		1,516	1,095
Over collateralization, net derivatives		(618)	(598)
Net amount		8	4
Subject to enforceable master netting arrangement | Derivative assets
Derivative [Line Items]
Gross amounts recognized, derivatives assets	[2]	38	50
Gross amounts offset in the balance sheet, derivatives assets	[2]	0	0
Net amounts presented in the balance sheet, derivatives assets	[2]	38	50
Gross amounts not offset in the balance sheet, financial instruments, derivatives assets	[1],[2]	(15)	(25)
Collateral received	[2]	(15)	(21)
Collateral pledged	[2]	0	0
Over collateralization, derivatives assets	[2]	0	0
Net amount, derivatives assets	[2]	8	4
Subject to enforceable master netting arrangement | Derivative liabilities
Derivative [Line Items]
Gross amounts recognized, derivatives liabilities	[2]	913	522
Gross amounts offset in the balance sheet, derivatives liabilities	[2]	0	0
Net amounts presented in the balance sheet, derivatives liabilities	[2]	913	522
Gross amounts not offset in the balance sheet, financial instruments, derivative liabilities	[1],[2]	(15)	(25)
Collateral received	[2]	0	0
Collateral pledged	[2]	(1,516)	(1,095)
Over collateralization, derivatives liabilities	[2]	618	598
Net amount, derivatives liabilities	[2]	$ 0	$ 0

[1] Amounts represent derivative assets and/or liabilities that are presented gross within the balance sheet but are held with the same counterparty where we have a master netting arrangement. This adjustment results in presenting the net asset and net liability position for each counterparty.

[2] Does not include amounts related to embedded derivatives as of September 30, 2023 and December 31, 2022.