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Accumulated Other Comprehensive Income - Components (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (3,131) $ (3,374)
Other comprehensive loss before reclassifications (318) 156
Amounts reclassified from accumulated other comprehensive income 120 78
Other comprehensive income / (loss) (198) 234
Balance at end of period (3,329) (3,140)
Defined benefit plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,449) (1,533)
Other comprehensive loss before reclassifications (4) 140
Amounts reclassified from accumulated other comprehensive income 85 55
Other comprehensive income / (loss) 81 195
Balance at end of period (1,368) (1,338)
Foreign currency translation    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,668) (1,817)
Other comprehensive loss before reclassifications (293) 40
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income / (loss) (293) 40
Balance at end of period (1,961) (1,777)
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 loss before reclassifications (21) (24)
Amounts reclassified from accumulated other comprehensive income 35 23
Other comprehensive income / (loss) 14 (1)
Balance at end of period $ 0 $ (25)