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Share-Based Compensation - Summary Of Stock Option Activity Under All Stock Plans (Detail)
shares in Millions
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Number Outstanding  
Beginning balance (shares) | shares 9.3
Options granted (shares) | shares 0.7
Options exercised (shares) | shares (2.7)
Options forfeited/expired (shares) | shares (0.1)
Ending balance (shares) | shares 7.2
Weighted Average Exercise Price Per Share  
Beginning balance (usd per share) | $ / shares $ 148.36
Options granted (usd per share) | $ / shares 287.11
Options exercised (usd per share) | $ / shares 140.70
Options forfeited/expired (usd per share) | $ / shares 204.94
Ending balance (usd per share) | $ / shares $ 164.16