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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 $ 1,485 $ 1,384 2,830 $ 2,550    
Balance at end of period 2,328   $ 2,328      
Common stock, cash paid for dividends, per share     $ 1.82 $ 1.66    
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     (2) (2)    
Stock award plans     $ 0 $ 0    
Stock award plans, shares     3 4    
Common stock issuances     $ 0 $ 0    
Common stock issuances, shares     2 1    
Conversions of class A to class B common stock     $ 0 $ 0    
Conversions of Class A to Class B common stock, shares     (8) (5)    
Balance at end of period $ 2 $ 2 $ 2 $ 2    
Balance at end of period, shares 168 178 168 178    
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     (2) (6)    
Conversions of class A to class B common stock     $ 0 $ 0    
Conversions of Class A to Class B common stock, shares     (8) (5)    
Balance at end of period $ 7 $ 7 $ 7 $ 7    
Balance at end of period, shares 693 688 693 688    
Additional Paid-in Capital            
Stockholders Equity Note [Roll Forward]            
Balance at beginning of period     $ 0 $ 0    
Common stock purchases     (383) (412)    
Stock award plans     170 157    
Common stock issuances     232 203    
Option premiums received (paid)     (19) 52    
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     (128) (489)    
Net income attributable to common shareowners     2,830 2,550    
Balance at end of period $ 7,665 $ 5,446 7,665 5,446    
Dividends ($0.91 and $0.83 per share)     $ (1,624) $ (1,495)    
Reclassification from AOCI pursuant to the early adoption of ASU 2018-02         $ 735 $ 0