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 ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Stockholders Equity Note [Roll Forward]            
Balance at beginning of period     $ 994      
Net income attributable to common shareowners $ 1,508 $ 1,259 4,338 $ 3,809    
Balance at end of period 3,098   $ 3,098      
Common stock, cash paid for dividends, per share     $ 2.73 $ 2.49    
Class A common stock            
Stockholders Equity Note [Roll Forward]            
Balance at beginning of period     $ 2 $ 2    
Balance at beginning of period, shares     173 180    
Common stock purchases     $ 0 $ 0    
Common stock purchases, shares     (3) (3)    
Stock award plans     $ 0 $ 0    
Stock award plans, shares     4 4    
Common stock issuances     $ 0 $ 0    
Common stock issuances, shares     3 2    
Conversions of class A to class B common stock     $ 0 $ 0    
Conversions of Class A to Class B common stock, shares     (12) (7)    
Balance at end of period $ 2 $ 2 $ 2 $ 2    
Balance at end of period, shares 165 176 165 176    
Class B common stock            
Stockholders Equity Note [Roll Forward]            
Balance at beginning of period     $ 7 $ 7    
Balance at beginning of period, shares     687 689    
Common stock purchases     $ 0 $ 0    
Common stock purchases, shares     (4) (9)    
Conversions of class A to class B common stock     $ 0 $ 0    
Conversions of Class A to Class B common stock, shares     (12) (7)    
Balance at end of period $ 7 $ 7 $ 7 $ 7    
Balance at end of period, shares 695 687 695 687    
Additional Paid-in Capital            
Stockholders Equity Note [Roll Forward]            
Balance at beginning of period     $ 0 $ 0    
Common stock purchases     (632) (604)    
Stock award plans     307 283    
Common stock issuances     312 268    
Option premiums received (paid)     13 53    
Balance at end of period $ 0 $ 0 0 0    
Retained Earnings            
Stockholders Equity Note [Roll Forward]            
Balance at beginning of period     5,852 4,880    
Common stock purchases     (124) (748)    
Net income attributable to common shareowners     4,338 3,809    
Balance at end of period $ 8,377 $ 5,728 8,377 5,728    
Dividends ($0.91 and $0.83 per share)     (2,408) (2,213)    
Reclassification from AOCI pursuant to the early adoption of ASU 2018-02         $ 735 $ 0
Other     $ (16) $ 0