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Accumulated Other Comprehensive Income - Components (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Balance at beginning of period $ (3,193) $ (3,131)
Other comprehensive (loss) / income before reclassifications 50 (318)
Amounts reclassified from accumulated other comprehensive income 551 120
Other comprehensive income / (loss) 601 (198)
Balance at end of period (2,592) (3,329)
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 (4) (4)
Amounts reclassified from accumulated other comprehensive income 53 85
Other comprehensive income / (loss) 49 81
Balance at end of period (1,415) (1,368)
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 (25) (293)
Amounts reclassified from accumulated other comprehensive income 553 0
Other comprehensive income / (loss) 528 (293)
Balance at end of period (1,231) (1,961)
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 79 (21)
Amounts reclassified from accumulated other comprehensive income (55) 35
Other comprehensive income / (loss) 24 14
Balance at end of period $ 54 $ 0