Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Options to Purchase Shares of Class A Common Stock Issued and Outstanding (Detail)

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STOCK-BASED COMPENSATION - Options to Purchase Shares of Class A Common Stock Issued and Outstanding (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Shares  
Ending Balance | shares 1,291
Exercisable at December 31, 2017 | shares 757
Weighted-Average Exercise Price  
Ending Balance | $ / shares $ 91.58
Exercisable at December 31, 2017 | $ / shares $ 83.28
Weighted-Average Remaining Contractual Term (in years)  
Outstanding at December 31, 2017 6 years 3 months 18 days
Nonqualified Stock Options  
Shares  
Beginning Balance | shares 1,828
Exercised | shares (802)
Granted | shares 272
Forfeited / Expired | shares (7)
Ending Balance | shares 1,291
Options Vested and Expected to Vest | shares 1,291
Exercisable at December 31, 2017 | shares 757
Weighted-Average Exercise Price  
Beginning Balance | $ / shares $ 80.45
Exercised | $ / shares 71.57
Granted | $ / shares 106.87
Forfeited / Expired | $ / shares 70.90
Ending Balance | $ / shares 91.58
Options Vested and Expected to Vest | $ / shares 91.58
Exercisable at December 31, 2017 | $ / shares $ 83.28
Weighted-Average Remaining Contractual Term (in years)  
Outstanding at December 31, 2017 6 years 3 months 18 days
Options Vested and Expected to Vest 6 years 3 months 18 days
Exercisable at December 31, 2017 4 years 9 months 18 days
Aggregate Intrinsic Value  
Outstanding at December 31, 2017 | $ $ 36
Options Vested and Expected to Vest | $ 36
Exercisable at December 31, 2017 | $ $ 27