Additional Information about Derivative Assets and Liabilities Subject to Enforceable Master Netting Arrangement (Detail) - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Gross amounts recognized, derivatives assets		$ 96	$ 433
Gross amounts recognized, derivatives liabilities		868	616
Subject to enforceable master netting arrangement
Derivative [Line Items]
Gross amounts recognized, net derivatives		(265)	388
Gross amounts offset in the balance sheet, net derivatives		0	0
Net amounts presented in the balance sheet, net derivatives		(265)	388
Gross amounts not offset in the balance sheet, financial instruments, net derivatives	[1]	0	0
Collateral received		(41)	(308)
Collateral pledged		825	536
Over collateralization, net derivatives		(507)	(528)
Net amount		12	88
Subject to enforceable master netting arrangement | Derivative assets
Derivative [Line Items]
Gross amounts recognized, derivatives assets	[2]	77	414
Gross amounts offset in the balance sheet, derivatives assets	[2]	0	0
Net amounts presented in the balance sheet, derivatives assets	[2]	77	414
Gross amounts not offset in the balance sheet, financial instruments, derivatives assets	[1],[2]	(24)	(20)
Collateral received	[2]	(41)	(308)
Collateral pledged	[2]	0	0
Over collateralization, derivatives assets	[2]	0	2
Net amount, derivatives assets	[2]	12	88
Subject to enforceable master netting arrangement | Derivative liabilities
Derivative [Line Items]
Gross amounts recognized, derivatives liabilities	[2]	342	26
Gross amounts offset in the balance sheet, derivatives liabilities	[2]	0	0
Net amounts presented in the balance sheet, derivatives liabilities	[2]	342	26
Gross amounts not offset in the balance sheet, financial instruments, derivative liabilities	[1],[2]	(24)	(20)
Collateral received	[2]	0	0
Collateral pledged	[2]	(825)	(536)
Over collateralization, derivatives liabilities	[2]	507	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] Does not include amounts related to embedded derivatives as of June 30, 2022 and December 31, 2021.