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Intangibles - (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes in intangibles    
Balance at beginning of year $ 9,296 $ 8,499
Additions 478 2,542
Disposals (7) (141)
Amortization (275) (201)
Acquisition of NLC 1,428  
Impairment of discontinued operations (1,422)  
Translation adjustment (487) (1,403)
Balance at end of year 9,011 9,296
Goodwill    
Changes in intangibles    
Balance at beginning of year 3,298 3,629
Translation adjustment (90) (331)
Balance at end of year 3,208 3,298
Concessions    
Changes in intangibles    
Balance at beginning of year 5,391 3,970
Additions 431 2,513
Disposals (7) (7)
Amortization (240) (177)
Acquisition of NLC 1,428  
Impairment of discontinued operations (1,422)  
Translation adjustment (358) (908)
Balance at end of year 5,223 5,391
Right of use    
Changes in intangibles    
Balance at beginning of year   140
Disposals   (134)
Amortization   (1)
Translation adjustment   (5)
Software    
Changes in intangibles    
Balance at beginning of year 76 76
Additions 47 29
Amortization (35) (23)
Translation adjustment (2) (6)
Balance at end of year 86 76
Research and development project and patents    
Changes in intangibles    
Balance at beginning of year 531 684
Translation adjustment (37) (153)
Balance at end of year 494 531
Gross carrying amount    
Changes in intangibles    
Balance at beginning of year 11,067  
Balance at end of year 10,550 11,067
Gross carrying amount | Goodwill    
Changes in intangibles    
Balance at beginning of year 3,298  
Balance at end of year 3,208 3,298
Gross carrying amount | Concessions    
Changes in intangibles    
Balance at beginning of year 6,393  
Balance at end of year 6,332 6,393
Gross carrying amount | Right of use    
Changes in intangibles    
Balance at beginning of year 102  
Balance at end of year   102
Gross carrying amount | Software    
Changes in intangibles    
Balance at beginning of year 743  
Balance at end of year 516 743
Gross carrying amount | Research and development project and patents    
Changes in intangibles    
Balance at beginning of year 531  
Balance at end of year 494 531
Accumulated amortization    
Changes in intangibles    
Balance at beginning of year (1,771)  
Balance at end of year (1,539) (1,771)
Accumulated amortization | Concessions    
Changes in intangibles    
Balance at beginning of year (1,002)  
Balance at end of year (1,109) (1,002)
Accumulated amortization | Right of use    
Changes in intangibles    
Balance at beginning of year (102)  
Balance at end of year   (102)
Accumulated amortization | Software    
Changes in intangibles    
Balance at beginning of year (667)  
Balance at end of year $ (430) $ (667)