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Accumulated Other Comprehensive Income - Components (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period $ (3,241) $ (3,400)  
Cumulative effect of change in accounting principle     $ 3
Other comprehensive income before reclassifications (66) 225  
Amounts reclassified from accumulated other comprehensive income 10 7  
Other comprehensive income (53) 232  
Balance at end of period (3,294) (3,168)  
Defined benefit plans      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period (1,583) (1,524)  
Cumulative effect of change in accounting principle    
Other comprehensive income before reclassifications  
Amounts reclassified from accumulated other comprehensive income 22 17  
Other comprehensive income 22 17  
Balance at end of period (1,561) (1,507)  
Foreign currency translation      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period (1,681) (1,879)  
Cumulative effect of change in accounting principle    
Other comprehensive income before reclassifications (61) 207  
Amounts reclassified from accumulated other comprehensive income  
Other comprehensive income (61) 207  
Balance at end of period (1,742) (1,672)  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Balance at beginning of period 23 3  
Cumulative effect of change in accounting principle     $ 3
Other comprehensive income before reclassifications (5) 18  
Amounts reclassified from accumulated other comprehensive income (12) (10)  
Other comprehensive income (14) 8  
Balance at end of period $ 9 $ 11