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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative, Collateral, Right to Reclaim Cash | $ 4 | $ 1
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 74 | 93
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 86 | 114
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 85 |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  | 113
Net Amount, Derivative Assets | 74 | 93
Derivative Asset, Fair Value, Gross Asset | 74 | 93
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 0
Derivative liabilities | 86 | 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 | 73 | 93
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 85 | 114
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 85 | 113
Net Amount, Derivative Assets | 73 | 93
Derivative Asset, Fair Value, Gross Asset | 73 | 93
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 0
Derivative liabilities | 85 | 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 | 38 | 41
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,739 | 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 | 38 | 41
Derivative Asset, Fair Value, Gross Asset | 38 | 41
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 0
Derivative liabilities | 1,739 | 1,835
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Derivative Liabilities Net Amount | 1,739 | 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 | 1,739 | 1,835
Derivative liabilities | 1,739 | 1,835
Derivative Liabilities Net Amount | 1,739 | 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 | 38 | 41
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  | 0
Net Amount, Derivative Assets | 38 | 41
Derivative Asset, Fair Value, Gross Asset | 38 | $ 41
Derivative Asset, Fair Value, Amount Offset Against Collateral | $ 0 |

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