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Accumulated Other Comprehensive Income - Components (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (3,193) $ (3,131)
Other comprehensive (loss) / income before reclassifications (9) (149)
Amounts reclassified from accumulated other comprehensive income 4 58
Other comprehensive income / (loss) (5) (91)
Balance at end of period (3,198) (3,222)
Defined benefit plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,464) (1,449)
Other comprehensive (loss) / income before reclassifications 0 206
Amounts reclassified from accumulated other comprehensive income 15 51
Other comprehensive income / (loss) 15 257
Balance at end of period (1,449) (1,192)
Foreign currency translation    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period (1,759) (1,668)
Other comprehensive (loss) / income before reclassifications (34) (316)
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income / (loss) (34) (316)
Balance at end of period (1,793) (1,984)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period 30 (14)
Other comprehensive (loss) / income before reclassifications 25 (39)
Amounts reclassified from accumulated other comprehensive income (11) 7
Other comprehensive income / (loss) 14 (32)
Balance at end of period $ 44 $ (46)