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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 75 | $ 60
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 75 | 59
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 90 | 77
Derivative Liabilities Gross Amount Of Collateral Cash And Securities Pledged Not Offset |  | 71
Fair value of derivative liabilities | 89 |
Net Amount, Derivative Assets | 75 | 59
Net Amount, Derivative Liabilities | 1 | 6
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 90 | 77
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Variable Interest Entity, Primary Beneficiary [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 52 | 66
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 52 | 66
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,657 | 1,712
Derivative Liabilities Gross Amount Of Collateral Cash And Securities Pledged Not Offset |  | 0
Fair value of derivative liabilities | 0 |
Net Amount, Derivative Assets | 52 | 66
Net Amount, Derivative Liabilities | 1,657 | 1,712
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 1,657 | 1,712
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 | 1
Net Amount, Derivative Liabilities | 0 | 1
Derivative Liability, Fair Value, Gross Liability | 0 | 1
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Interest Rate Swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 75 | 60
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 75 | 59
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 90 | 72
Fair value of derivative liabilities | 89 | 67
Net Amount, Derivative Assets | 75 | 59
Net Amount, Derivative Liabilities | 1 | 5
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  | 0
Derivative Liability, Fair Value, Gross Liability | 89 | 72
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Interest Rate Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 1,657 | 1,712
Net Amount, Derivative Liabilities | 1,657 | 1,712
Derivative Liability, Fair Value, Gross Liability | 1,657 | 1,712
Future [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities |  | 3
Fair value of derivative liabilities |  | 3
Net Amount, Derivative Liabilities |  | 0
Derivative Liability, Fair Value, Gross Liability |  | 3
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 0
Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 52 | 66
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 52 | 66
Net Amount, Derivative Assets | $ 52 | 66
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  | $ 0

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