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Shareholders' Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Changes in Shareholders' Equity [Roll Forward]          
Beginning balance     $ 17    
Net income $ 650 $ 746 1,821 $ 1,958  
Other comprehensive income (loss), net of tax 115 16 357 118  
Ending balance 267   267    
Accumulated other comprehensive income (loss), cumulative translation losses 2,929   2,929   $ 3,212
Accumulated other comprehensive income (loss), unrecognized retirement plan and other retiree benefits costs 898   898   $ 977
Common Stock          
Changes in Shareholders' Equity [Roll Forward]          
Beginning balance     1,466    
Ending balance 1,466   1,466    
Additional Paid-in Capital          
Changes in Shareholders' Equity [Roll Forward]          
Beginning balance     1,691    
Stock-based compensation expense     106    
Shares issued for stock options     166    
Shares issued for restricted stock units     (33)    
Other     2    
Ending balance 1,932   1,932    
Unearned Compensation          
Changes in Shareholders' Equity [Roll Forward]          
Beginning balance     (7)    
Other     6    
Ending balance (1)   (1)    
Treasury Stock          
Changes in Shareholders' Equity [Roll Forward]          
Beginning balance     (19,135)    
Shares issued for stock options     274    
Shares issued for restricted stock units     33    
Treasury stock acquired     (1,055)    
Other     5    
Ending balance (19,878)   (19,878)    
Retained Earnings          
Changes in Shareholders' Equity [Roll Forward]          
Beginning balance     19,922    
Net income     1,701    
Dividends     (1,406)    
Other     (10)    
Ending balance 20,207   20,207    
Accumulated Other Comprehensive Income (Loss)          
Changes in Shareholders' Equity [Roll Forward]          
Beginning balance     (4,180)    
Other comprehensive income (loss), net of tax 113 $ 14 346 $ 121  
Ending balance (3,834)   (3,834)    
Noncontrolling Interests          
Changes in Shareholders' Equity [Roll Forward]          
Beginning balance     260    
Net income     120    
Other comprehensive income (loss), net of tax     11    
Dividends     (16)    
Ending balance $ 375   $ 375