Quarterly report pursuant to Section 13 or 15(d)

Activity in Deferred Compensation Program (Detail)

v3.10.0.1
Activity in Deferred Compensation Program (Detail) - USD ($)
shares in Millions, $ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Stockholders Equity Note [Roll Forward]    
Balance at beginning of period (1)  
Balance at end of period (1)  
Balance at beginning of period $ 994  
Balance at end of period $ 3,098  
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 $ (37) $ (45)
Reinvested dividends (2) (2)
Benefit payments 7 10
Balance at end of period (32) (37)
Deferred Compensation Obligations    
Stockholders Equity Note [Roll Forward]    
Balance at beginning of period 37 45
Reinvested dividends (2) (2)
Benefit payments 7 10
Balance at end of period $ 32 $ 37