Common Stock and Stock Compensation - Table Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Shares Subject to Option (in shares):
Outstanding, Beginning Balance (in shares) | shares	35,749,906
Exercised (in shares) | shares	11,120,613
Cancelled (in shares) | shares	43,429
Outstanding, Ending Balance (in shares) | shares	24,585,864
Exercisable, Ending Balance (in shares) | shares	21,133,320
Weighted Average Exercise Price (in dollars per share):
Outstanding, Weighted Average Exercise Price, Beginning of Period (in dollars per share) | $ / shares	$ 40.96
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares	40.26
Cancelled, Weighted Average Exercise Price (in dollars per share) | $ / shares	41.38
Outstanding, Weighted Average Exercise Price, End of Period (in dollars per share) | $ / shares	41.28
Exercisable, Weighted Average Exercise Price, End of Period (in dollars per share) | $ / shares	$ 41.26