Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current tax expense:
Federal	$ 1,862.6	$ 1,996.6	$ 1,629.4
State and local	93.9	133.0	65.8
Total current tax expense	1,956.5	2,129.6	1,695.2
Deferred tax expense (benefit)	129.1	(58.6)	112.8
Total income tax expense	$ 2,085.6	$ 2,071.0	$ 1,808.0