Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income before income taxes (benefit):
Domestic	$ 3,877.0	$ 3,540.4	$ 3,655.4
Foreign	2,022.6	1,588.4	1,277.6
Income before income tax expense and equity in loss of investee, net of tax	5,899.6	5,128.8	4,933.0
Current
Federal	1,131.8	2,201.4	1,304.3
State	45.5	57.0	55.1
Foreign	140.0	108.6	52.9
Total	1,317.3	2,367.0	1,412.3
Deferred
Federal	(62.0)	241.0	(125.6)
State	(7.4)	9.9	(3.8)
Foreign	177.7	(159.2)	(45.6)
Total	108.3	91.7	(175.0)
Total income tax expense	$ 1,425.6	$ 2,458.7	$ 1,237.3