Share-Based Incentive Plan (Stock Awards) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares under stock awards, outstanding at beginning of period	16,207,777	13,563,881	16,616,617
Weightedaverage exercise price per share, outstanding at beginning of period	$ 33.21	$ 22.05	$ 19.54
Number of shares under stock awards, granted	937,873	6,226,185	2,182,035
Weighted average exercise price per share, granted	$ 54.92	$ 52.37	$ 32.92
Number of shares under stock awards, exercised	(5,092,660)	(2,720,048)	(4,367,871)
Weighted average exercise price per share, exercised	$ 22.48	$ 20.25	$ 17.80
Number of shares under stock awards, forfeited	(220,491)	(862,241)	(866,900)
Weighted average exercise price per share, forfeited	$ 46.36	$ 38.28	$ 23.12
Number of shares under stock awards converted	(4,100,000)
Weighted average exercise price per share, converted	$ 53.33
Number of shares under stock awards, outstanding at end of period	7,732,499	16,207,777	13,563,881
Weighted average exercise price per share, outstanding at end of period	$ 31.85	$ 33.21	$ 22.05
Number of shares under stock awards, vested and expected to vest at period end	7,374,244
Weighted average exercise price per share, vested and expected to vest at period end	$ 31.09
Number of shares under stock awards, exercisable at period end	5,146,821
Weighted average exercise price per share, exercisable at period end	$ 23.56