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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative, Collateral, Right to Reclaim Cash $ 9 $ 1
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 78 93
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 94 114
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 93  
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities   113
Net Amount, Derivative Assets 78 93
Derivative Asset, Fair Value, Gross Asset 78 93
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative liabilities 94 114
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Derivative Liabilities Net Amount 1 1
Interest Rate Swap [Member]    
Derivatives, Fair Value [Line Items]    
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 78 93
Derivative Asset, Fair Value, Amount Not Offset Against Collateral   0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 93 114
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 93 113
Net Amount, Derivative Assets 78 93
Derivative Asset, Fair Value, Gross Asset 78 93
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative liabilities 94 114
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Derivative Liabilities Net Amount 1 1
Other Credit Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 0  
Derivative liabilities 0  
Derivative Liability, Fair Value, Amount Offset Against Collateral 0  
Derivative Liabilities Net Amount 0  
Variable Interest Entity, Primary Beneficiary [Member]    
Derivatives, Fair Value [Line Items]    
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 40 41
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 1,830 1,835
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 40 41
Derivative Asset, Fair Value, Gross Asset 40 41
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative liabilities 1,830 1,835
Derivative Liability, Fair Value, Amount Offset Against Collateral 0 0
Derivative Liabilities Net Amount 1,830 1,835
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 1,830 1,835
Derivative liabilities 1,830 1,835
Derivative Liabilities Net Amount 1,830 1,835
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 40 41
Derivative Asset, Fair Value, Amount Not Offset Against Collateral   0
Net Amount, Derivative Assets 40 41
Derivative Asset, Fair Value, Gross Asset 40 $ 41
Derivative Asset, Fair Value, Amount Offset Against Collateral $ 0