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Premises, Equipment and Leases - Operating Lease Portfolio (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Lessee, Lease, Description [Line Items]    
Right-of-use assets $ 1,433  
Lease liabilities $ 1,756  
Weighted-average remaining lease term 8 years 10 months 24 days  
Weighted-average discount rate 3.30%  
Operating lease cost $ 316  
Variable lease cost 39  
Total lease cost 355  
Sublease income (26)  
Net lease cost 329  
Cash paid for amounts included in the measurement of lease liabilities 328  
Right-of-use assets obtained in exchange for lease liabilities 112  
Accounting Standards Update 2016-02    
Lessee, Lease, Description [Line Items]    
Right-of-use assets   $ 1,600
Lease liabilities   $ 1,900
Right-of-use assets recognized upon adoption of new lease standard $ 1,601