Additional Information about Derivative Assets and Liabilities Subject to Enforceable Master Netting Arrangement (Detail) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Gross amounts recognized, derivatives assets		$ 214	$ 433
Gross amounts recognized, derivatives liabilities		602	616
Subject to enforceable master netting arrangement
Derivative [Line Items]
Gross amounts recognized, net derivatives		121	388
Gross amounts offset in the balance sheet, net derivatives		0	0
Net amounts presented in the balance sheet, net derivatives		121	388
Gross amounts not offset in the balance sheet, financial instruments, net derivatives	[1]	0	0
Collateral received		(110)	(308)
Collateral pledged		567	536
Over collateralization, net derivatives		(526)	(528)
Net amount		52	88
Subject to enforceable master netting arrangement | Derivative assets
Derivative [Line Items]
Gross amounts recognized, derivatives assets	[2]	198	414
Gross amounts offset in the balance sheet, derivatives assets	[2]	0	0
Net amounts presented in the balance sheet, derivatives assets	[2]	198	414
Gross amounts not offset in the balance sheet, financial instruments, derivatives assets	[1],[2]	(49)	(20)
Collateral received	[2]	(110)	(308)
Collateral pledged	[2]	0	0
Over collateralization, derivatives assets	[2]	13	2
Net amount, derivatives assets	[2]	52	88
Subject to enforceable master netting arrangement | Derivative liabilities
Derivative [Line Items]
Gross amounts recognized, derivatives liabilities	[2]	77	26
Gross amounts offset in the balance sheet, derivatives liabilities	[2]	0	0
Net amounts presented in the balance sheet, derivatives liabilities	[2]	77	26
Gross amounts not offset in the balance sheet, financial instruments, derivative liabilities	[1],[2]	(49)	(20)
Collateral received	[2]	0	0
Collateral pledged	[2]	(567)	(536)
Over collateralization, derivatives liabilities	[2]	539	530
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] Included $1 million of accruals on derivatives classified as other assets as of March 31, 2022 and does not include amounts related to embedded derivatives as of March 31, 2022 and December 31, 2021.