Quarterly report pursuant to Section 13 or 15(d)

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

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Roll-forward of Common Stock, Additional Paid-in Capital, and Retained Earnings Accounts (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stockholders Equity Note [Roll Forward]        
Common stock purchases     (11.3) (14.4)
Balance at beginning of period     $ 7,035  
Net income 1,116 1,092 2,086 2,007
Common stock purchases     (870) (1,055)
Balance at end of period 7,645   7,645  
Class A common stock
        
Stockholders Equity Note [Roll Forward]        
Balance at beginning of period       258
Common stock purchases     (3.0) (4.0)
Stock award plans     4 2
Common stock issuances     2 2
Conversions of Class A to Class B common stock     (8) (11)
Balance at end of period 235 247 235 247
Balance at beginning of period     3 3
Balance at end of period 3 3 3 3
Class B common stock
        
Stockholders Equity Note [Roll Forward]        
Balance at beginning of period       735
Common stock purchases     (8.0) (10.0)
Conversions of Class A to Class B common stock     8 11
Balance at end of period 725 736 725 736
Balance at beginning of period     7 7
Balance at end of period 7 7 7 7
Additional Paid-in Capital
        
Stockholders Equity Note [Roll Forward]        
Balance at beginning of period     0 0
Stock award plans     291 236
Common stock issuances     144 126
Option premiums received (paid)     206 (150)
Common stock purchases     (606) (209)
Balance at end of period 0 3 0 3
StockRepurchaseProgramRepurchaseAmountUnsettled (35) 0 (35) 0
Retained Earnings
        
Stockholders Equity Note [Roll Forward]        
Balance at beginning of period     10,128 10,604
Net income     2,086 2,007
Dividends ($0.57 and $0.52 per share)     (1,123) (1,048)
Common stock purchases     (264) (846)
Balance at end of period $ 10,827 $ 10,717 $ 10,827 $ 10,717
Common stock, cash paid for dividends, per share $ 1.14 $ 1.04