Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Available for sale, amortized cost	$ 29,229.1	$ 23,659.0
Held to maturity, fair value	20,654.5	24,473.0
Financing receivable, deferred commitment fee	$ 6.3	$ 5.9
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)	195,969,746	205,126,224
Treasury stock, shares (in shares)	49,201,778	40,045,300
Series D Preferred Stock
Preferred stock, shares outstanding (in shares)	5,000	5,000
Series E Preferred Stock
Preferred stock, shares outstanding (in shares)	16,000	16,000