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Stock-Based Compensation and Other Stock Plans - Summary of Stock Option Activity (Detail) - Stock Option [Member]
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]  
Shares, Outstanding at beginning of year | shares 2,811
Shares, Granted | shares 644
Shares, Exercised | shares (416)
Shares, Forfeited or expired | shares (28)
Shares, Outstanding at end of year | shares 3,011
Shares, Exercisable at end of year | shares 1,776
Exercise Price per Share, Outstanding at beginning of year | $ / shares $ 88.62
Exercise Price per Share, Granted | $ / shares 138.04
Exercise Price per Share, Exercised | $ / shares 74.10
Exercise Price per Share, Forfeited or expired | $ / shares 133.11
Exercise Price per Share, Outstanding at end of year | $ / shares 100.78
Exercise Price per Share, Exercisable at end of year | $ / shares $ 76.51
Remaining Contractual Term, Outstanding at end of year 6 years 7 months 6 days
Remaining Contractual Term, Exercisable at end of year 5 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding at end of year | $ $ 212.3
Aggregate Intrinsic Value, Exercisable at end of year | $ $ 168.3