Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Additional Information (Detail)

v3.20.4
STOCK-BASED COMPENSATION - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation expense $ 796.0 $ 915.0 $ 634.0
Share-based Payment Arrangement, Expense, Tax Benefit $ 210.0 $ 216.0 $ 186.0
Discounted Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Issued During Period, Shares, Employee Stock Purchase Plans 900,000 1,000,000.0 900,000
Stock Issued Employee Stock Purchase Plan Average Price Per Share $ 110.92 $ 102.11 $ 105.53
Incentive Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 26,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 7,000,000    
Incentive Compensation Plan [Member] | Restricted Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award Decrease In Number Of Shares Available For Grant For Each Share Of Award Granted 1    
Management Incentive Award | Restricted Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 8 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 827.0 $ 457.0 $ 596.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 37.0    
Long Term Incentive Performance Award | Restricted Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting (exercisable) period of awards 3 years    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 112.0 71.0 97.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 31.0    
Nonqualified Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from Stock Options Exercised $ 28.0 7.0 12.0
Vesting (exercisable) period of awards 5 years    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 17.0 5.0 6.0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 3.0    
Percentage of the award vesting at each anniversary date of the grant 20.00%    
Discounted Employee Stock Purchase Modified Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award Exercisable Price Percentage Of Closing Price Of Another Class Of Stock 95.00%    
Minimum | Management Incentive Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Paid in Restricted Units, Percent 50.00%    
Minimum | Long Term Incentive Performance Award | Restricted Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Consolidated operating return 33.33%    
Maximum | Management Incentive Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Paid in Restricted Units, Percent 66.67%    
Maximum | Long Term Incentive Performance Award | Restricted Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Consolidated operating return 66.67%    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Exercise of Option, Tax Benefit $ 272.0 $ 148.0 $ 175.0
Share-based Payment Arrangement, Tranche One [Member] | Management Incentive Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation expense $ 133.0    
Vesting (exercisable) period of awards 5 years    
Percentage of the award vesting at each anniversary date of the grant 20.00%    
Share-based Payment Arrangement, Tranche One [Member] | Management Incentive Award | U.S. Domestic Package      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock compensation expense $ 104.0    
Share-based Payment Arrangement, Tranche Two [Member] | Management Incentive Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting (exercisable) period of awards 1 year