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MSR (Activity Related to the MSR Portfolio) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Servicing Assets at Fair Value    
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights $ 3 $ (13)
Interest Rate Contract | Servicing Rights | Mortgage banking net revenue    
Servicing Assets at Fair Value    
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights 3 (13)
Changes in fair value and settlement of free-standing derivatives purchased to economically hedge the MSR portfolio (Mortgage banking net revenue) [1] 60 (49)
MSR fair value adjustments due to change in inputs or assumptions $ (84) [1] $ 28
[1]

(a) Included in mortgage banking net revenue in the Condensed Consolidated Statements of Income.