Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Restricted Stock Units Outstanding, Including Reinvested Dividends (Detail)

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STOCK-BASED COMPENSATION - Restricted Stock Units Outstanding, Including Reinvested Dividends (Detail) - Long Term Incentive Performance Award - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Units [Member]      
Shares      
Beginning Balance 11,475    
Vested (5,100)    
Granted 3,927    
Reinvested Dividends 332    
Forfeited / Expired (163)    
Ending Balance 10,471 11,475  
Restricted Units Expected to Vest 10,325    
Weighted-Average Grant Date Fair Value      
Beginning Balance $ 94.32    
Vested 90.71    
Granted 105.62 $ 97.04 $ 100.63
Forfeited / Expired 99.70    
Ending Balance 99.16 $ 94.32  
Restricted Units Expected to Vest $ 99.20    
Weighted-Average Remaining Contractual Term (in years)      
Nonvested at December 31, 2017 1 year 4 months 17 days    
Restricted Units Expected to Vest 1 year 4 months 17 days    
Aggregate Intrinsic Value      
Nonvested at December 31, 2017 $ 1,248    
Restricted Units Expected to Vest $ 1,230    
Restricted Units      
Shares      
Beginning Balance 1,683    
Vested (839)    
Granted 958    
Reinvested Dividends 73    
Forfeited / Expired (88)    
Ending Balance 1,787 1,683  
Restricted Units Expected to Vest 1,699    
Weighted-Average Grant Date Fair Value      
Beginning Balance $ 101.36    
Vested 97.11    
Granted 105.65 $ 105.50 $ 96.64
Forfeited / Expired 103.87    
Ending Balance 105.58 $ 101.36  
Restricted Units Expected to Vest $ 105.72    
Weighted-Average Remaining Contractual Term (in years)      
Nonvested at December 31, 2017 1 year 6 months 12 days    
Restricted Units Expected to Vest 1 year 6 months 14 days    
Aggregate Intrinsic Value      
Nonvested at December 31, 2017 $ 213    
Restricted Units Expected to Vest $ 202