Share-Based Compensation (Narrative) (Details) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Number of stock options granted | shares	20.7
Number of restricted share units granted | shares	5.9
Weighted average fair value of stock options granted | $ / shares	$ 11.45
Weighted average fair value of restricted share units granted | $ / shares	$ 59.5
Restricted Share Units [Member]
Unrecognized pretax compensation expense on nonvested awards | $	$ 831
Stock Options [Member]
Unrecognized pretax compensation expense on nonvested awards | $	$ 448