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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt securities $ 41,155.7 $ 38,722.2
Held to maturity, fair value 17,797.4 12,249.3
Financing receivable, deferred commitment fee $ 9.8 $ 14.1
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, par value (in dollars per share) $ 1.6667 $ 1.6667
Common stock, shares authorized (in shares) 560,000,000 560,000,000
Common stock, shares outstanding (in shares) 208,289,178 209,709,046
Treasury stock, shares (in shares) 36,882,346 35,462,478
Series C Preferred Stock    
Preferred stock, shares outstanding (in shares) 0 16,000
Series D Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0  
Preferred stock, shares outstanding (in shares) 5,000 5,000
Series E Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0  
Preferred stock, shares outstanding (in shares) 16,000 16,000