Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax expense (benefit):
Federal	$ 1,996.6	$ 1,629.4	$ 1,226.4
State and local	133.0	65.8	(42.6)
Total current tax expense	2,129.6	1,695.2	1,183.8
Deferred tax (benefit) expense	(58.6)	112.8	22.1
Total income tax expense	$ 2,071.0	$ 1,808.0	$ 1,205.9