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Derivatives (Offsetting Derivative Financial Instruments) (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Derivative Fair Value Gross Amount Assets Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet $ 1,673 $ 1,114
Derivative, Collateral, Obligation to Return Cash (542) (271)
Derivative Fair Value Gross Amount Liabilities Not Offset Against Collateral Net    
Derivative Liability, Fair Value, Gross Liability 741 874
Assets    
Derivative Fair Value Gross Amount Assets Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet [1] 1,655 1,107
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (417) (410)
Derivative, Collateral, Obligation to Return Cash [2] (504) (348)
Derivative, Fair Value, Amount Offset Against Collateral, Net 734 349
Liabilities    
Derivative Fair Value Gross Amount Liabilities Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet [1] 741 874
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (417) (410)
Derivative Liability, Fair Value, Gross Liability [2] (97) (123)
Derivative Fair Value Amount Offset Against Collateral Net 227 341
Derivative | Assets    
Derivative Fair Value Gross Amount Assets Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet [1] 1,655 1,107
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (417) (410)
Derivative, Collateral, Obligation to Return Cash [2] (504) (348)
Derivative, Fair Value, Amount Offset Against Collateral, Net 734 349
Derivative | Liabilities    
Derivative Fair Value Gross Amount Liabilities Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet [1] 741 874
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (417) (410)
Derivative Liability, Fair Value, Gross Liability [2] (97) (123)
Derivative Fair Value Amount Offset Against Collateral Net $ 227 $ 341
[1] Amount does not include IRLCs because these instruments are not subject to master netting or similar arrangements.
[2] Amount of collateral received as an offset to asset positions or pledged as an offset to liability positions. Collateral values in excess of related derivative amounts recognized in the Consolidated Balance Sheets were excluded from this table.