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
 6 Months Ended
Jun. 30, 2018
Jun. 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 $ 2,328  
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 (1) (1)
Benefit payments 7 10
Balance at end of period (31) (36)
Deferred Compensation Obligations    
Stockholders Equity Note [Roll Forward]    
Balance at beginning of period 37 45
Reinvested dividends (1) (1)
Benefit payments 7 10
Balance at end of period $ 31 $ 36