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Employee Benefit Plans - Schedule of Stock Appreciation Rights Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Stock Appreciation Rights - Stock Settled [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of SARs Outstanding Beginning Balance 4,155,528  
Number of SARs Granted 1,076,560  
Number of SARs Exercised (723,433)  
Number of SARs Canceled (193,783)  
Number of SARs Outstanding Ending Balance 4,314,872  
Weighted Average Exercise Price Outstanding Beginning Balance $ 81.97  
Weighted Average Exercise Price Granted 132.13  
Weighted Average Exercise Price Exercised 78.25  
Weighted Average Exercise Price Canceled 98.55  
Weighted Average Exercise Price Outstanding Ending Balance $ 94.37  
Aggregate Intrinsic Value $ 260 $ 142
Stock Appreciation Rights - Cash Settled [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of SARs Outstanding Beginning Balance 247,397  
Number of SARs Granted 11,597  
Number of SARs Exercised (76,885)  
Number of SARs Canceled (10,269)  
Number of SARs Outstanding Ending Balance 171,840  
Weighted Average Exercise Price Outstanding Beginning Balance $ 57.98  
Weighted Average Exercise Price Granted 131.82  
Weighted Average Exercise Price Exercised 56.03  
Weighted Average Exercise Price Canceled 85.98  
Weighted Average Exercise Price Outstanding Ending Balance $ 62.15  
Aggregate Intrinsic Value $ 16 $ 14