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Goodwill and Other Intangible Assets - Changes in the Carrying Amounts of Other Intangible Assets (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Document Period End Date Sep. 30, 2019      
Intangible Assets, Net (Excluding Goodwill) $ 1,648 $ 2,140 $ 2,062 $ 1,791
Amortization [1] (9) (13)    
Origination of Mortgage Servicing Rights (MSRs) 251 260    
Servicing Assets at Fair Value, Purchased   89    
Due to changes in inputs or assumptions [2] (439) 198    
Servicing Asset at Fair Value, Other Changes in Fair Value [3] (215) (183)    
Servicing Asset at Fair Value, Disposals (2) (2)    
Finite-Lived Intangible Assets, Accumulated Amortization (43)   (34)  
Intangible Assets, Gross (Excluding Goodwill) 1,691   2,096  
Mortgage Servicing Rights, Fair Value [Member]        
Amortization [1] 0 0    
Origination of Mortgage Servicing Rights (MSRs) 237 250    
Servicing Assets at Fair Value, Purchased   89    
Due to changes in inputs or assumptions [2] (439) 198    
Servicing Asset at Fair Value, Other Changes in Fair Value [3] (215) (183)    
Servicing Asset at Fair Value, Disposals (2) (2)    
Servicing Asset at Fair Value, Amount 1,564 2,062 1,983 1,710
Other Intangible Assets [Member]        
Intangible Assets, Net (Excluding Goodwill) 12 14 13 16
Amortization [1] (1) (2)    
Origination of Mortgage Servicing Rights (MSRs) 0 0    
Servicing Assets at Fair Value, Purchased   0    
Due to changes in inputs or assumptions [2] 0 0    
Servicing Asset at Fair Value, Other Changes in Fair Value [3] 0 0    
Servicing Asset at Fair Value, Disposals 0 0    
Finite-Lived Intangible Assets, Gross [4] 6   6  
Finite-Lived Intangible Assets, Accumulated Amortization [4] (6)   (5)  
Finite-Lived Intangible Assets, Net [4] 0   1  
Indefinite-lived Intangible Assets (Excluding Goodwill) 12   12  
Commercial Mortgage Servicing Rights [Member]        
Intangible Assets, Net (Excluding Goodwill) 72 64 66 $ 65
Amortization [1] (8) (11)    
Origination of Mortgage Servicing Rights (MSRs) 14 10    
Servicing Assets at Fair Value, Purchased   0    
Due to changes in inputs or assumptions [2] 0 0    
Servicing Asset at Fair Value, Other Changes in Fair Value [3] 0 0    
Servicing Asset at Fair Value, Disposals 0 $ 0    
Finite-Lived Intangible Assets, Gross [4] 109   95  
Finite-Lived Intangible Assets, Accumulated Amortization [4] (37)   (29)  
Finite-Lived Intangible Assets, Net [4] 72   66  
Fair Value, Recurring [Member]        
Servicing Asset at Fair Value, Amount $ 1,564      
Fair Value, Recurring [Member] | Mortgage Servicing Rights, Fair Value [Member]        
Servicing Asset at Fair Value, Amount     $ 1,983  
[1] Does not include expense associated with community development investments. See Note 11, “Certain Transfers of Financial Assets and Variable Interest Entities,” for additional information.
[2] Primarily reflects changes in option adjusted spreads and prepayment speed assumptions due to changes in interest rates.
[3] Represents changes due to the collection of expected cash flows, net of accretion due to the passage of time.
[4] Excludes other intangible assets that are indefinite-lived, carried at fair value, or fully amortized.