Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)

v3.21.1
Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)
$ in Millions
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
$ / security
Mar. 31, 2020
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held for sale, measured at fair value $ 1,680 $ 1,585  
Loans and leases, measured at fair value 7,003 6,681  
Other assets, measured at fair value 17,212 15,718  
Nonrecurring | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held for sale, measured at fair value 66 792 $ 628
Loans and leases, measured at fair value 85 301 117
Other assets, measured at fair value 2,155 $ 576 $ 24
Nonrecurring | Level 3 | Market comparables      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measured at fair value 194    
Nonrecurring | Level 3 | Discounted cash flow      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measured at fair value $ 1,955    
Price | Nonrecurring | Level 3 | Discounted cash flow | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measurement input 73 8  
Price | Nonrecurring | Level 3 | Discounted cash flow | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measurement input 99 99  
Price | Nonrecurring | Level 3 | Discounted cash flow | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measurement input 84 95  
OREO discount | Nonrecurring | Level 3 | Market comparables | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans and leases, measurement input 0.13 0.13  
OREO discount | Nonrecurring | Level 3 | Market comparables | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans and leases, measurement input 0.59 0.59  
OREO discount | Nonrecurring | Level 3 | Market comparables | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans and leases, measurement input 0.24 0.24  
Costs to sell | Nonrecurring | Level 3 | Market comparables | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans and leases, measurement input 0.08 0.08  
Costs to sell | Nonrecurring | Level 3 | Market comparables | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans and leases, measurement input 0.26 0.26  
Costs to sell | Nonrecurring | Level 3 | Market comparables | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans and leases, measurement input 0.09 0.09  
Revenue attrition | Nonrecurring | Level 3 | Discounted cash flow | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.02  
Revenue attrition | Nonrecurring | Level 3 | Discounted cash flow | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.19  
Revenue attrition | Nonrecurring | Level 3 | Discounted cash flow | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.07  
Discount rate | Nonrecurring | Level 3 | Discounted cash flow      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input 0.07    
Discount rate | Nonrecurring | Level 3 | Discounted cash flow | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.11  
Discount rate | Nonrecurring | Level 3 | Discounted cash flow | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.14  
Discount rate | Nonrecurring | Level 3 | Discounted cash flow | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.12