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Accumulated Other Comprehensive Income - Components (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (3,131) $ (3,374)
Other comprehensive income / (loss) before reclassifications (149) 78
Amounts reclassified from accumulated other comprehensive income 58 7
Other comprehensive income (91) 85
Balance at end of period (3,222) (3,289)
Defined benefit plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,449) (1,533)
Other comprehensive income / (loss) before reclassifications 206 13
Amounts reclassified from accumulated other comprehensive income 51 1
Other comprehensive income 257 14
Balance at end of period (1,192) (1,519)
Foreign currency translation    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,668) (1,817)
Other comprehensive income / (loss) before reclassifications (316) 59
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income (316) 59
Balance at end of period (1,984) (1,758)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (14) (24)
Other comprehensive income / (loss) before reclassifications (39) 6
Amounts reclassified from accumulated other comprehensive income 7 6
Other comprehensive income (32) 12
Balance at end of period $ (46) $ (12)