Quarterly report pursuant to Section 13 or 15(d)

Activity in Deferred Compensation Program (Detail)

v3.2.0.727
Activity in Deferred Compensation Program (Detail) - USD ($)
shares in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Stockholders Equity Note [Roll Forward]    
Balance at beginning of period (1)  
Balance at end of period (1)  
Balance at beginning of period $ 2,141  
Balance at end of period $ 1,950  
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 $ (59) $ (69)
Reinvested dividends (2) (1)
Benefit payments 11 12
Balance at end of period (50) (58)
Deferred Compensation Obligations    
Stockholders Equity Note [Roll Forward]    
Balance at beginning of period 59 69
Reinvested dividends 2 1
Benefit payments (11) (12)
Balance at end of period $ 50 $ 58