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Premises, Equipment and Leases - Operating Lease Portfolio (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Right-of-use assets $ 1,316 $ 1,433
Lease liabilities $ 1,688 $ 1,756
Weighted-average remaining lease term 8 years 8 months 12 days 8 years 10 months 24 days
Weighted-average discount rate 3.10% 3.30%
Operating lease cost $ 315 $ 316
Variable lease cost 43 39
Total lease cost 358 355
Sublease income (26) (26)
Net lease cost 332 329
Cash paid for amounts included in the measurement of lease liabilities 325 328
Right-of-use assets obtained in exchange for lease liabilities $ 180 $ 112
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities us-gaap:OtherLiabilities
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets us-gaap:OtherAssets
Accounting Standards Update 2016-02    
Lessee, Lease, Description [Line Items]    
Right-of-use assets recognized upon adoption of new lease standard $ 0 $ 1,601