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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale $ 20,854,000,000 $ 19,428,000,000
Loans held for sale   0
Derivative assets 526,000,000 531,000,000
Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale 20,854,000,000 19,428,000,000
Other investments 103,000,000 115,000,000
Loans held for sale 71,000,000 54,000,000
Derivative assets 526,000,000 531,000,000
Nonrecurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Impaired loans 17,000,000 42,000,000
Level 3 [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale 25,000,000 20,000,000
Other investments 9,000,000 8,000,000
Loans held for sale 1,000,000 0
Derivative assets 7,000,000 8,000,000
Level 3 [Member] | Nonrecurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Impaired loans 17,000,000 42,000,000
Valuation Technique, Discounted Cash Flow [Member] | Level 3 [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments $ 8,000,000  
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments, measurement input 0.1483  
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments, measurement input 0.1759  
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments, measurement input 0.1572  
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Marketability [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments, measurement input 0.3000  
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price Volatility [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments, measurement input 0.4900  
Valuation, Market Comparable Pricing [Member] | Level 3 [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale $ 1,000,000  
Loans held for investment $ 3,000,000  
Valuation, Market Comparable Pricing [Member] | Measurement Input, Comparability Adjustment [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, measurement input 0.8050  
Loans held for investment, measurement input 0.7757  
Valuation, Market Comparable Pricing [Member] | Measurement Input, Comparability Adjustment [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, measurement input 0.9700  
Loans held for investment, measurement input 0.9475  
Valuation, Market Comparable Pricing [Member] | Measurement Input, Comparability Adjustment [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Loans held for sale, measurement input 0.8674  
Loans held for investment, measurement input 0.8950  
Valuation, Fair Value Of Underlying Collateral [Member] | Level 3 [Member] | Nonrecurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Impaired loans $ 17,000,000 $ 42,000,000
Valuation, Fair Value Of Underlying Collateral [Member] | Measurement Input, Discount Rate [Member] | Level 3 [Member] | Nonrecurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Impaired loans, measurement input 0.2000 0.2000
Valuation, Fair Value Of Underlying Collateral [Member] | Measurement Input, Discount Rate [Member] | Level 3 [Member] | Nonrecurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Impaired loans, measurement input 0.5000 0.4000
Valuation, Fair Value Of Underlying Collateral [Member] | Measurement Input, Discount Rate [Member] | Level 3 [Member] | Nonrecurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Impaired loans, measurement input 0.2300 0.2100
Valuation, Appraised Value [Member] | Level 3 [Member] | Nonrecurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
OREO and other Level 3 assets $ 2,000,000  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Level 3 [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets $ 3,000,000  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.0002  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 1.00  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.021  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Internal Risk Rating [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 1  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Internal Risk Rating [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 19  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Internal Risk Rating [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 8.80  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Given Default [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Given Default [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 1  
Interest Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Given Default [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.49  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Level 3 [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities $ (1,000,000)  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities, measurement input 0.0002  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities, measurement input 1.00  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities, measurement input 0.0257  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Internal Risk Rating [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities, measurement input 1  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Internal Risk Rating [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities, measurement input 19  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Internal Risk Rating [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities, measurement input 9.32  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Given Default [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities, measurement input 0  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Given Default [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities, measurement input 1  
Credit [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loss Given Default [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative liabilities, measurement input 0.50  
Other [Member] | Valuation Technique, Discounted Cash Flow [Member] | Level 3 [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets $ 4,000,000  
Other [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loan Closing Rates [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.3593  
Other [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loan Closing Rates [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.9969  
Other [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Loan Closing Rates [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Derivative assets, measurement input 0.7610  
Other Securities [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale $ 25,000,000 $ 20,000,000
Other Securities [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale 25,000,000 20,000,000
Other Securities [Member] | Level 3 [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale 25,000,000 20,000,000
Other Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] | Level 3 [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale $ 25,000,000  
Other Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale, measurement input 0.1434  
Other Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale, measurement input 0.1501  
Other Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale, measurement input 0.1462  
Other Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Marketability [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale, measurement input 0.3000  
Other Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price Volatility [Member] | Level 3 [Member] | Recurring [Member] | Minimum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale, measurement input 0.3700  
Other Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price Volatility [Member] | Level 3 [Member] | Recurring [Member] | Maximum [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale, measurement input 0.4200  
Other Securities [Member] | Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Price Volatility [Member] | Level 3 [Member] | Recurring [Member] | Weighted Average [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Securities available for sale, measurement input 0.3993  
Principal Investments Direct [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments $ 1,000,000 1,000,000
Principal Investments Direct [Member] | Level 3 [Member] | Recurring [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Other investments $ 1,000,000 $ 1,000,000