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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total allowance $ 3,944.0 $ 2,742.0 $ 2,629.0
Common stock, par value (in dollars per share) $ 5 $ 5  
Common stock, authorized (shares) 800,000,000 800,000,000  
Common stock, issued (shares) 542,000,000 542,000,000  
Common stock held in treasury at cost (shares) 118,000,000 109,000,000  
Preferred stock (less than) [1] $ 0.5 $ 0.5  
Portion at Fair Value, Fair Value Disclosure      
Loans held for sale, fair value 1,500.0   1,100.0
Loans, fair value 1,100.0   700.0
Other assets, fair value 100.0   $ 100.0
Other borrowed funds, fair value 100.0 $ 100.0  
Cumulative Effect, Period of Adoption, Adjustment | Held-to-maturity Securities [Member] | Accounting Standards Update 2016-13      
Total allowance 2.0    
Cumulative Effect, Period of Adoption, Adjustment | Other Current Assets [Member] | Accounting Standards Update 2016-13      
Total allowance $ 19.0    
[1]
Amounts include our equity investment in BlackRock.