Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Millions	Total	PREFERRED STOCK	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	TREASURY STOCK
Beginning balance at Dec. 31, 2022	$ 11,259.5	$ 884.9	$ 408.6	$ 983.5	$ 13,798.5	$ (1,569.2)	$ (3,246.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	334.6				334.6
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	203.0					203.0
Dividends Declared:
Common Stock	(158.6)				(158.6)
Preferred Stock	(16.2)				(16.2)
Stock Awards and Options Exercised	66.4			(19.0)			85.4
Stock Purchased	(100.9)						(100.9)
Ending balance at Mar. 31, 2023	11,587.8	884.9	408.6	964.5	13,958.3	(1,366.2)	(3,262.3)
Beginning balance at Dec. 31, 2022	11,259.5	884.9	408.6	983.5	13,798.5	(1,569.2)	(3,246.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	994.2
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	205.8
Dividends Declared:
Stock Purchased	(201.3)
Ending balance at Sep. 30, 2023	11,847.2	884.9	408.6	993.1	14,281.6	(1,363.4)	(3,357.6)
Beginning balance at Mar. 31, 2023	11,587.8	884.9	408.6	964.5	13,958.3	(1,366.2)	(3,262.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	331.8				331.8
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	(39.7)					(39.7)
Dividends Declared:
Common Stock	(157.8)				(157.8)
Preferred Stock	(4.7)				(4.7)
Stock Awards and Options Exercised	17.6			15.5			2.1
Stock Purchased	(99.3)						(99.3)
Ending balance at Jun. 30, 2023	11,635.7	884.9	408.6	980.0	14,127.6	(1,405.9)	(3,359.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	327.8				327.8
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	42.5					42.5
Dividends Declared:
Common Stock	(157.6)				(157.6)
Preferred Stock	(16.2)				(16.2)
Stock Awards and Options Exercised	17.2			13.1			4.1
Stock Purchased	(1.1)						(1.1)
Excise Tax on Share Repurchases	(1.1)						(1.1)
Ending balance at Sep. 30, 2023	11,847.2	884.9	408.6	993.1	14,281.6	(1,363.4)	(3,357.6)
Beginning balance at Dec. 31, 2023	11,897.9	884.9	408.6	1,009.6	14,233.8	(1,137.9)	(3,501.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	214.7				214.7
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	220.3					220.3
Dividends Declared:
Common Stock	(153.4)				(153.4)
Preferred Stock	(16.2)				(16.2)
Stock Awards and Options Exercised	71.0			(26.1)			97.1
Stock Purchased	(132.0)						(132.0)
Excise Tax on Share Repurchases	(0.5)						(0.5)
Ending balance at Mar. 31, 2024	12,101.8	884.9	408.6	983.5	14,278.9	(917.6)	(3,536.5)
Beginning balance at Dec. 31, 2023	11,897.9	884.9	408.6	1,009.6	14,233.8	(1,137.9)	(3,501.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,575.7
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	358.4
Dividends Declared:
Stock Purchased	(684.2)
Ending balance at Sep. 30, 2024	12,749.0	884.9	408.6	1,008.1	15,313.1	(779.5)	(4,086.2)
Beginning balance at Mar. 31, 2024	12,101.8	884.9	408.6	983.5	14,278.9	(917.6)	(3,536.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	896.1				896.1
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	52.6					52.6
Dividends Declared:
Common Stock	(154.3)				(154.3)
Preferred Stock	(4.7)				(4.7)
Stock Awards and Options Exercised	17.5			13.4			4.1
Stock Purchased	(250.8)						(250.8)
Excise Tax on Share Repurchases	(2.4)						(2.4)
Ending balance at Jun. 30, 2024	12,655.8	884.9	408.6	996.9	15,016.0	(865.0)	(3,785.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	464.9				464.9
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	85.5					85.5
Dividends Declared:
Common Stock	(151.6)				(151.6)
Preferred Stock	(16.2)				(16.2)
Stock Awards and Options Exercised	15.0			11.2			3.8
Stock Purchased	(301.4)						(301.4)
Excise Tax on Share Repurchases	(3.0)						(3.0)
Ending balance at Sep. 30, 2024	$ 12,749.0	$ 884.9	$ 408.6	$ 1,008.1	$ 15,313.1	$ (779.5)	$ (4,086.2)