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Derivatives (Offsetting Derivative Financial Instruments) (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Derivative Fair Value Gross Amount Assets Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet $ 4,100 $ 1,673
Derivative, Collateral, Obligation to Return Cash (447) (542)
Derivative Fair Value Gross Amount Liabilities Not Offset Against Collateral Net    
Derivative Liability, Fair Value, Gross Liability 1,866 741
Assets    
Derivative Fair Value Gross Amount Assets Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet [1] 4,031 1,655
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (915) (417)
Derivative, Collateral, Obligation to Return Cash [2] (1,187) (504)
Derivative, Fair Value, Amount Offset Against Collateral, Net 1,929 734
Liabilities    
Derivative Fair Value Gross Amount Liabilities Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet [1] 1,866 741
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (915) (417)
Derivative Liability, Fair Value, Gross Liability [2] (119) (97)
Derivative Fair Value Amount Offset Against Collateral Net 832 227
Derivative | Assets    
Derivative Fair Value Gross Amount Assets Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet [1] 4,031 1,655
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (915) (417)
Derivative, Collateral, Obligation to Return Cash [2] (1,187) (504)
Derivative, Fair Value, Amount Offset Against Collateral, Net 1,929 734
Derivative | Liabilities    
Derivative Fair Value Gross Amount Liabilities Not Offset Against Collateral Net    
Gross Amount Recognized in the Balance Sheet [1] 1,866 741
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (915) (417)
Derivative Liability, Fair Value, Gross Liability [2] (119) (97)
Derivative Fair Value Amount Offset Against Collateral Net $ 832 $ 227
[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 Condensed Consolidated Balance Sheets were excluded from this table.