Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative, Collateral, Right to Reclaim Cash	$ 6	$ 13
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	55	76
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	76	95
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	73
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities		93
Net Amount, Derivative Assets	55	76
Derivative Asset, Fair Value, Gross Asset	56	76
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative liabilities	76	95
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liabilities Net Amount	3	2
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	55	76
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	74	94
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	73	93
Net Amount, Derivative Assets	55	76
Derivative Asset, Fair Value, Gross Asset	56	76
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative liabilities	75	94
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liabilities Net Amount	2	1
Other Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	1	0
Derivative liabilities	1	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liabilities Net Amount	1	0
Variable Interest Entity, Primary Beneficiary [Member]
Derivatives, Fair Value [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	42	38
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	1,866	1,940
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities		0
Net Amount, Derivative Assets	42	38
Derivative Asset, Fair Value, Gross Asset	42	38
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative liabilities	1,866	1,940
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liabilities Net Amount	1,866	1,940
Variable Interest Entity, Primary Beneficiary [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	1,866	1,940
Derivative liabilities	1,866	1,940
Derivative Liabilities Net Amount	1,866	1,940
Variable Interest Entity, Primary Beneficiary [Member] | Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	42	38
Derivative Asset, Fair Value, Amount Not Offset Against Collateral		0
Net Amount, Derivative Assets	42	38
Derivative Asset, Fair Value, Gross Asset	42	$ 38
Derivative Asset, Fair Value, Amount Offset Against Collateral	$ 0