Quarterly report pursuant to Section 13 or 15(d)

Activity in Deferred Compensation Program (Detail)

v2.3.0.15
Activity in Deferred Compensation Program (Detail) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2011
Treasury Stock
Sep. 30, 2010
Treasury Stock
Sep. 30, 2011
Deferred Compensation Obligations
Sep. 30, 2010
Deferred Compensation Obligations
Stockholders Equity Note [Line Items]            
Balance at beginning of period 2 2 (2) (2)    
Reinvested dividends            
Benefit payments            
Balance at end of period 2 2 (2) (2)    
Balance at beginning of period $ 7,798 $ 7,979 $ (103) $ (108) $ 103 $ 108
Reinvested dividends     (3) (3) 3 3
Benefit payments     19 10 (19) (10)
Balance at end of period $ 7,798 $ 7,979 $ (87) $ (101) $ 87 $ 101