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Noncontrolling Interests (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Activity for equity attributable to noncontrolling interests        
Beginning Balance     $ 30,801 $ 35,226
Net income (loss) $ 1,873 $ 436 4,427 (2,391)
Dividends paid     (1,009) (986)
Repurchase of company common stock     (2,073) (2,045)
Distributions to noncontrolling interests     (105) (84)
Other [1]     258 992
Ending Balance 32,079 30,712 32,079 30,712
Adjustments for New Accounting Pronouncement [Member]        
Activity for equity attributable to noncontrolling interests        
Beginning Balance     30,801  
Accounting Standards Update 2014-09 [Member]        
Activity for equity attributable to noncontrolling interests        
Change in Accounting Principle [2]     (220)  
Common Stockholders' Equity [Member]        
Activity for equity attributable to noncontrolling interests        
Beginning Balance     30,607 34,974
Net income (loss)     4,389 (2,434)
Dividends paid     (1,009) (986)
Repurchase of company common stock     (2,073) (2,045)
Distributions to noncontrolling interests     0 0
Other [1]     256 991
Ending Balance 31,950 30,500 31,950 30,500
Common Stockholders' Equity [Member] | Accounting Standards Update 2014-09 [Member]        
Activity for equity attributable to noncontrolling interests        
Change in Accounting Principle [2]     (220)  
Noncontrolling Interest [Member]        
Activity for equity attributable to noncontrolling interests        
Beginning Balance     194 252
Net income (loss)     38 43
Dividends paid     0 0
Repurchase of company common stock     0 0
Distributions to noncontrolling interests     (105) (84)
Other [1]     2 1
Ending Balance $ 129 $ 212 129 $ 212
Noncontrolling Interest [Member] | Accounting Standards Update 2014-09 [Member]        
Activity for equity attributable to noncontrolling interests        
Change in Accounting Principle [2]     $ 0  
[1]
**Includes components of other comprehensive income, which are disclosed separately in our Consolidated Statement of Comprehensive Income.
[2]
*See Note 2—Changes in Accounting Principles for additional information related to ASC Topic 606.