Equity (Details of Stock Options) (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Equity [Abstract]
Number of Options, Vested or expected to vest | shares	789,826
Weighted Average Exercise Price, Vested or expected to vest | $ / shares	$ 179.16
Weighted Average Remaining Contractual Life, Vested or expected to vest	6 years 9 months 18 days
Aggregate Intrinsic Value, Vested or expected to vest | $	$ 71
Number of Options, Exercised | shares	544,367
Weighted Average Exercise Price, Exercised | $ / shares	$ 154.58
Weighted Average Remaining Contractual Life, Exercised	5 years 10 months 24 days
Aggregate Intrinsic Value, Exercised | $	$ 62