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Goodwill and Other Intangible Assets - Changes in the Carrying Amounts of Other Intangible Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets, Net (Excluding Goodwill) $ 2,062 [1] $ 1,791 [1] $ 1,657
Amortization [2] (18) (20)  
Origination of Mortgage Servicing Rights (MSRs) 352 411  
Servicing Assets at Fair Value, Purchased 89    
Due to changes in inputs or assumptions [3] 90 (22)  
Servicing Asset at Fair Value, Other Changes in Fair Value [4] (239) (226)  
Servicing Asset at Fair Value, Disposals 3 8  
Intangible Assets, Written off Related to Sale of Business Unit [5]   (1)  
Finite-Lived Intangible Assets, Accumulated Amortization [1] (34) (42)  
Finite-Lived Intangible Assets, Net 67    
Indefinite-lived Intangible Assets (Excluding Goodwill) 12 12  
Intangible Assets, Gross (Excluding Goodwill) [1] 2,096 1,833  
Mortgage Servicing Rights, Fair Value [Member]      
Amortization [2] 0 0  
Origination of Mortgage Servicing Rights (MSRs) 336 394  
Servicing Assets at Fair Value, Purchased 89    
Due to changes in inputs or assumptions [3] 90 (22)  
Servicing Asset at Fair Value, Other Changes in Fair Value [4] (239) (226)  
Servicing Asset at Fair Value, Disposals 3 8  
Intangible Assets, Written off Related to Sale of Business Unit [5]   0  
Servicing Asset at Fair Value, Amount 1,983 1,710 1,572
Other Intangible Assets [Member]      
Intangible Assets, Net (Excluding Goodwill) 79 81 $ 85
Amortization [2] (18) (20)  
Origination of Mortgage Servicing Rights (MSRs) 16 17  
Servicing Assets at Fair Value, Purchased 0    
Due to changes in inputs or assumptions [3] 0 0  
Servicing Asset at Fair Value, Other Changes in Fair Value [4] 0 0  
Servicing Asset at Fair Value, Disposals 0 0  
Intangible Assets, Written off Related to Sale of Business Unit [5]   (1)  
Finite-Lived Intangible Assets, Gross [1] 6 32  
Finite-Lived Intangible Assets, Accumulated Amortization [1] (5) (28)  
Finite-Lived Intangible Assets, Net [1] 1 4  
Commercial Mortgage Servicing Rights [Member]      
Finite-Lived Intangible Assets, Gross [1] 95 79  
Finite-Lived Intangible Assets, Accumulated Amortization [1] (29) (14)  
Finite-Lived Intangible Assets, Net [1] 66 65  
Fair Value, Measurements, Recurring [Member]      
Servicing Asset at Fair Value, Amount $ 1,983 $ 1,710  
[1] Excludes other intangible assets that are indefinite-lived, carried at fair value, or fully amortized.
[2] Does not include expense associated with community development investments. See Note 12, “Certain Transfers of Financial Assets and Variable Interest Entities,” for additional information.
[3] Primarily reflects changes in option adjusted spreads and prepayment speed assumptions, due to changes in interest rates.
[4] Represents changes due to the collection of expected cash flows, net of accretion due to the passage of time.
[5] Represents measurement period adjustment on other intangible assets acquired previously in the Pillar acquisition.