Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 598.2	$ 356.2	$ 1,398.9	$ 1,075.1
Weighted-average shares:
Basic (in shares)	775.6	793.0	778.1	796.0
Effect of dilutive securities:
Options, restricted stock units, performance-based restricted stock units and other (in shares)	25.9	32.3	26.6	33.7
Diluted (in shares)	801.5	825.3	804.7	829.7
Net income per share:
Basic (in dollars per share)	$ 0.77	$ 0.45	$ 1.80	$ 1.35
Diluted (in dollars per share)	$ 0.75	$ 0.43	$ 1.74	$ 1.30