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Changes in Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance $ 32,981 $ 30,718 $ 32,064 $ 30,801
Net income (loss) 1,597 1,654 3,443 2,554
Other Comprehensive Income (Loss), Net of Tax 87 (266) 276 (177)
Dividends paid (346) (337) (696) (675)
Repurchase of company common stock (1,250) (646) (2,002) (1,146)
Distributions to noncontrolling interests (43) (8) (60) (42)
Distributed under benefit plans 45 104 43 124
Change in Accounting Principle 0 0 0 (220) [1]
Other (3) (3) (6) (3)
Ending Balance 33,074 31,222 33,074 31,222
Par Value - Common Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 18 18 18 18
Ending Balance 18 18 18 18
Capital in excess of par [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 46,877 46,642 46,879 46,622
Distributed under benefit plans 45 104 43 124
Ending Balance 46,922 46,746 46,922 46,746
Treasury Stock [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (43,656) (40,406) (42,905) (39,906)
Repurchase of company common stock (1,250) (646) (2,002) (1,146)
Other     (1)  
Ending Balance (44,906) (41,052) (44,906) (41,052)
Accumulated Other Comprehensive Income (Loss) [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (5,914) (5,371) (6,063) (5,518)
Other Comprehensive Income (Loss), Net of Tax 87 (266) 276 (177)
Change in Accounting Principle     (40) [2] 58 [1]
Ending Balance (5,827) (5,637) (5,827) (5,637)
Retained Earnings [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 35,534 29,663 34,010 29,391
Net income (loss) 1,580 1,640 3,413 2,528
Dividends paid (346) (337) (696) (675)
Change in Accounting Principle     40 [2] (278) [1]
Other (1) (1) (2) (1)
Ending Balance 36,769 30,967 36,769 30,967
Noncontrolling Interest [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 122 172 125 194
Net income (loss) 17 14 30 26
Distributions to noncontrolling interests (43) (8) (60) (42)
Other (2) (2) (3) (2)
Ending Balance $ 98 $ 180 $ 98 $ 180
[1] *Cumulative effect of the adoption of ASC Topic 606, “Revenue from Contracts with Customers,” and ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Liabilities,” at January 1, 2018.
[2] *See Note 2—Changes in Accounting Principles for additional information.