Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)

v3.20.2
Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
$ / security
Sep. 30, 2019
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held for sale, measured at fair value $ 1,905 $ 3,709  
Loans and leases, measured at fair value 7,234 8,335  
Other assets, measured at fair value 12,725 15,518  
Nonrecurring | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held for sale, measured at fair value 903 102 $ 111
Loans and leases, measured at fair value 226 257 232
Other assets, measured at fair value $ 576 $ 640 $ 658
Price | Nonrecurring | Level 3 | Discounted cash flow | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measurement input 8 85  
Price | Nonrecurring | Level 3 | Discounted cash flow | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measurement input 99 97  
Price | Nonrecurring | Level 3 | Discounted cash flow | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measurement input 94 88  
Discount rate | Nonrecurring | Level 3 | Market Comparables | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans and leases, measurement input 0.13 0.13  
Discount rate | Nonrecurring | Level 3 | Market Comparables | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans and leases, measurement input 0.59 0.59  
Discount rate | 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  
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    
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    
Customer attrition | Nonrecurring | Level 3 | Discounted cash flow | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0  
Customer attrition | Nonrecurring | Level 3 | Discounted cash flow | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.19  
Customer attrition | Nonrecurring | Level 3 | Discounted cash flow | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.05  
Cost to service | Nonrecurring | Level 3 | Discounted cash flow | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.11  
Cost to service | Nonrecurring | Level 3 | Discounted cash flow | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.19  
Cost to service | Nonrecurring | Level 3 | Discounted cash flow | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.15