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Loans and Allowance for Loan Losses - Summary of Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Loans disclosures            
Loans held for investment $ 84,974   $ 88,213      
Allowance for loan losses (1,371) $ (1,452) (538) $ (573) $ (562) $ (474)
Loans held for investment, net 83,603   87,675      
Net unamortized discounts and premiums and deferred fees and costs 153   320      
Commercial            
Loans disclosures            
Loans held for investment 49,981   45,745      
Allowance for loan losses (881) (932) (354) (400) (407)  
Consumer            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans     42,465      
Loans held for investment 34,993   42,468      
Allowance for loan losses (490) $ (520) (184) $ (173) $ (155)  
Commercial and industrial | Commercial Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 30,870   26,338      
Commercial mortgage | Commercial Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 16,600   16,895      
Construction | Commercial Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 1,550   1,511      
Lease financing | Commercial Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 961   1,001      
Residential mortgage and home equity | Consumer Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 31,619   38,018      
Home equity loans | Consumer Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans 1,732   2,049      
Other consumer | Consumer Loans            
Loans disclosures            
Loans and Leases Receivable Net of Deferred Income and Purchased Credit Impaired Loans $ 3,374   $ 4,450