XML 107 R82.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefit Plans (Schedule of Stock Option Activity) (Details) - $ / shares
shares in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Beginning Balance (in shares) 17 16 15
Granted (in shares) 4 5 3
Exercised (in shares) (5) (3) (2)
Cancelled (in shares) (1) (1) 0
Ending Balance (in shares) 15 17 16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Beginning Balance (in dollars per share) $ 53.21 $ 47.19 $ 41.56
Granted (in dollars per share) 80.05 63.58 65.91
Exercised (in dollars per share) 44.72 36.15 29.67
Cancelled (in dollars per share) 70.50 62.25 54.08
Ending Balance (in dollars per share) $ 61.97 $ 53.21 $ 47.19