Quarterly report pursuant to Section 13 or 15(d)

Roll-forward of Common Stock, Additional Paid-in Capital, and Retained Earnings Accounts (Detail)

v2.3.0.15
Roll-forward of Common Stock, Additional Paid-in Capital, and Retained Earnings Accounts (Detail) (USD $)
In Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Stockholders Equity Note [Line Items]        
Common stock purchases     (31.7) (9.3)
Balance at beginning of period     $ 7,979  
Net income 1,042 991 2,990 2,369
Common stock purchases     (2,190) (589)
Balance at end of period 7,798   7,798  
Class A common stock
        
Stockholders Equity Note [Line Items]        
Balance at beginning of period     258 285
Common stock purchases     (6.0) (3.0)
Stock award plans     4 2
Common stock issuances     3 2
Conversions of Class A to Class B common stock     (15) (22)
Balance at end of period 244 264 244 264
Balance at beginning of period     3 3
Stock award plans        
Conversions of Class A to Class B common stock        
Balance at end of period 3 3 3 3
Class B common stock
        
Stockholders Equity Note [Line Items]        
Balance at beginning of period     735 711
Common stock purchases     (26.0) (6.0)
Conversions of Class A to Class B common stock     15 22
Balance at end of period 724 727 724 727
Balance at beginning of period     7 7
Conversions of Class A to Class B common stock        
Balance at end of period 7 7 7 7
Additional Paid-In Capital
        
Stockholders Equity Note [Line Items]        
Balance at beginning of period       2
Stock award plans     375 324
Common stock purchases     (417) (491)
Common stock issuances     192 165
Option premiums paid     (150)  
Retained Earnings
        
Stockholders Equity Note [Line Items]        
Balance at beginning of period     14,164 12,745
Net income     2,990 2,369
Dividends ($1.56 and $1.41 per share)     (1,553) (1,413)
Common stock purchases     (1,773) (98)
Balance at end of period $ 13,828 $ 13,603 $ 13,828 $ 13,603