Annual report pursuant to Section 13 and 15(d)

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

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SHAREOWNERS' EQUITY - Roll-forward of Common Stock, Additional Paid-in Capital, and Retained Earnings Accounts (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common stock purchases, Shares                 (21.8) (38.7) (12.4)
Balance at beginning of year       $ 7,035         $ 7,035    
Net income attributable to controlling interests (1,748) 469 1,116 970 725 1,072 1,092 915 807 3,804 3,338
Common stock purchases                 (1,638) (2,669) (809)
Balance at end of period 4,653       7,035       4,653 7,035  
Class A Common Stock
                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year, Shares       240       258 240 258 285
Common stock purchases, Shares                 (9.0) (7.0) (6.0)
Stock award plans, Shares                 8 7 6
Common stock issuances, Shares                 3 3 3
Conversions of class A to class B common stock, Shares                 (17) (21) (30)
Balance at end of year, Shares 225       240       225 240 258
Balance at beginning of year       3       3 3 3 3
Common stock purchases                 0 0 0
Stock award plans                 0 0 0
Common stock issuances                 0 0 0
Conversions of class A to class B common stock                 0 0 0
Balance at end of period 3       3       3 3 3
Class B Common Stock
                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year, Shares       725       735 725 735 711
Common stock purchases, Shares                 (13.0) (31.0) (6.0)
Conversions of class A to class B common stock, Shares                 17 21 30
Balance at end of year, Shares 729       725       729 725 735
Balance at beginning of year       7       7 7 7 7
Common stock purchases                 0 0 0
Conversions of class A to class B common stock                 0 0 0
Balance at end of period 7       7       7 7 7
Additional Paid-In Capital
                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year       0       0 0 0 2
Stock award plans                 444 388 398
Common stock purchases                 (943) (475) (649)
Common stock issuances                 293 287 249
Option Premiums Received (Paid)                 206 (200) 0
Balance at end of period 0       0       0 0 0
Retained Earnings
                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year       10,128       10,604 10,128 10,604 9,335
Net income attributable to controlling interests                 807 3,804 3,338
Dividends ($2.28, $2.08 and $1.88 per share)                 (2,243) (2,086) (1,909)
Common stock purchases                 (695) (2,194) (160)
Balance at end of period $ 7,997       $ 10,128       $ 7,997 $ 10,128 $ 10,604