Net Income Per Common Share (Schedule of Average Shares Excluded From Diluted Net Income Per Common Share Computation) (Details) (Stock Options) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average outstanding options	7.2	12.2	7.9	13.6
Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	49.22	37.45	48.17	34.78
Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Exercise price	60.82	61.94	61.94	61.94