Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 28,000,000	$ 76,000,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	27,000,000	76,000,000
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	38,000,000	95,000,000
Derivative Liabilities Gross Amount Of Collateral Cash And Securities Pledged Not Offset		93,000,000
Fair value of derivative liabilities	38,000,000
Net Amount, Derivative Assets	27,000,000	76,000,000
Net Amount, Derivative Liabilities	0	2,000,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	0
Derivative Liability, Fair Value, Gross Liability	38,000,000	95,000,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Variable Interest Entity [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	239,000,000	38,000,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	239,000,000	38,000,000
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	1,048,000,000	1,940,000,000
Derivative Liabilities Gross Amount Of Collateral Cash And Securities Pledged Not Offset		0
Fair value of derivative liabilities	0
Net Amount, Derivative Assets	239,000,000	38,000,000
Net Amount, Derivative Liabilities	1,048,000,000	1,940,000,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	0
Derivative Liability, Fair Value, Gross Liability	1,048,000,000	1,940,000,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Other Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities		0
Net Amount, Derivative Liabilities		0
Derivative Liability, Fair Value, Gross Liability		0
Derivative Liability, Fair Value, Amount Offset Against Collateral		0
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	27,000,000	76,000,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	27,000,000	76,000,000
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	38,000,000	94,000,000
Fair value of derivative liabilities	38,000,000	93,000,000
Net Amount, Derivative Assets	27,000,000	76,000,000
Net Amount, Derivative Liabilities	0	1,000,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		0
Derivative Liability, Fair Value, Gross Liability	38,000,000	94,000,000
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Interest Rate Swaps [Member] | Variable Interest Entity [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	190,000,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	190,000,000
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	1,048,000,000	1,940,000,000
Net Amount, Derivative Assets	190,000,000
Net Amount, Derivative Liabilities	1,048,000,000	1,940,000,000
Derivative Liability, Fair Value, Gross Liability	1,048,000,000	1,940,000,000
Interest Rate Swaps [Member] | Variable Interest Entity [Member] | Level 3 [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Currency Swaps [Member] | Variable Interest Entity [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	49,000,000	38,000,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	49,000,000	38,000,000
Net Amount, Derivative Assets	49,000,000	38,000,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		$ 0
Warrant [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,000,000
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	1,000,000
Net Amount, Derivative Assets	$ 1,000,000