Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)

v3.20.1
Fair Value Measurements - Nonrecurring Fair Value Inputs (Details)
$ in Millions
Mar. 31, 2020
USD ($)
$ / security
Dec. 31, 2019
USD ($)
$ / security
Mar. 31, 2019
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measured at fair value $ 3,609 $ 3,709  
Loans and leases, measured at fair value 9,016 8,335  
Other assets, measured at fair value 6,789 15,518  
Nonrecurring | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measured at fair value 628 102 $ 0
Loans and leases, measured at fair value 117 257 120
Other assets, measured at fair value $ 24 $ 640 $ 6
Measurement Input, Price | Nonrecurring | Level 3 | Discounted cash flow | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measurement input 9 85  
Measurement Input, 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  
Measurement Input, Price | Nonrecurring | Level 3 | Discounted cash flow | Weighted Average      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Loans held-for-sale, measurement input | $ / security 95 88  
Measurement Input, 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  
Measurement Input, 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  
Measurement Input, 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  
Measurement Input, Cost 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  
Measurement Input, Cost 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  
Measurement Input, Cost 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  
Measurement Input, Customer Attrition | Nonrecurring | Level 3 | Discounted cash flow | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.00  
Measurement Input, Customer Attrition | Nonrecurring | Level 3 | Discounted cash flow | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Other assets, measurement input   0.19  
Measurement Input, 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  
Measurement Input, 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  
Measurement Input, 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  
Measurement Input, 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