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 ($)
shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common stock purchases, Shares (2.6)               (16.1) (25.2) (26.8)
Balance at beginning of year       $ 405         $ 405    
Net income attributable to controlling interests $ 1,104 $ 1,264 $ 1,384 $ 1,158 $ (239) $ 1,270 $ 1,269 $ 1,131 4,910 $ 3,431 $ 4,844
Common stock purchases (300)               (1,816) (2,680) (2,711)
Balance at end of period $ 1,000       $ 405       1,000 405  
Payments for Repurchase of Common Stock                 $ 1,813 $ 2,678 $ 2,702
Common Stock | Class A Common Stock:                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year, Shares       180.0       194.0 180.0 194.0 201.0
Common stock purchases, Shares                 (4.0) (4.0) (4.0)
Stock award plans, Shares                 4.0 5.0 5.0
Common stock issuances, Shares                 3.0 2.0 3.0
Conversions of class A to class B common stock, Shares                 (10.0) (17.0) (11.0)
Balance at end of year, Shares 173.0       180.0       173.0 180.0 194.0
Balance at beginning of year       $ 2       $ 2 $ 2 $ 2 $ 2
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 $ 2       $ 2       $ 2 $ 2 $ 2
Common Stock | Class B Common Stock:                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year, Shares       689.0       693.0 689.0 693.0 705.0
Common stock purchases, Shares                 (12.0) (21.0) (23.0)
Conversions of class A to class B common stock, Shares                 10.0 17.0 11.0
Balance at end of year, Shares 687.0       689.0       687.0 689.0 693.0
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 0
Stock award plans                 396 541 492
Common stock purchases                 (813) (898) (791)
Common stock issuances                 363 303 316
Option premiums received (paid)                 54 54 (17)
Balance at end of period 0       0       0 0 0
Retained Earnings:                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance at beginning of year       $ 4,879       $ 6,001 4,879 6,001 5,726
Net income attributable to controlling interests                 4,910 3,431 4,844
Dividends ($3.32, $3.12, and $2.92 per share)                 (2,928) (2,771) (2,649)
Common stock purchases                 (1,003) (1,782) (1,920)
Balance at end of period $ 5,858       $ 4,879       $ 5,858 $ 4,879 $ 6,001