Quarterly report pursuant to Section 13 or 15(d)

Activity in Deferred Compensation Program (Detail)

v3.8.0.1
Activity in Deferred Compensation Program (Detail) - USD ($)
shares in Millions, $ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Stockholders Equity Note [Roll Forward]    
Balance at beginning of period (1)  
Balance at end of period (1)  
Balance at beginning of period $ 405  
Balance at end of period $ 1,509  
Treasury Stock [Member]    
Stockholders Equity Note [Roll Forward]    
Balance at beginning of period (1) (1)
Reinvested dividends 0 0
Benefit payments 0 0
Balance at end of period (1) (1)
Balance at beginning of period $ (45) $ (51)
Reinvested dividends (2) (2)
Benefit payments 10 9
Balance at end of period (37) (44)
Deferred Compensation Obligations    
Stockholders Equity Note [Roll Forward]    
Balance at beginning of period 45 51
Reinvested dividends (2) (2)
Benefit payments 10 9
Balance at end of period $ 37 $ 44