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Intangibles - (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in intangibles    
Balance at beginning of year $ 8,499 $ 7,962
Additions 2,542 478
Disposals (141) (17)
Amortization (201) (307)
Impairment (note 18)   (123)
Acquisition of subsidiary   728
Translation adjustment (1,403) (222)
Balance at end of year 9,296 8,499
Goodwill    
Changes in intangibles    
Balance at beginning of year 3,629 3,653
Translation adjustment (331) (24)
Balance at end of year 3,298 3,629
Railways concessions    
Changes in intangibles    
Balance at beginning of year 3,970 4,061
Additions 2,513 439
Disposals (7) (17)
Amortization (177) (239)
Impairment (note 18)   (112)
Acquisition of subsidiary   3
Translation adjustment (908) (165)
Balance at end of year 5,391 3,970
Contract right    
Changes in intangibles    
Balance at beginning of year 140 137
Disposals (134)  
Amortization (1) (2)
Translation adjustment (5) 5
Balance at end of year   140
Software    
Changes in intangibles    
Balance at beginning of year 76 111
Additions 29 39
Amortization (23) (66)
Impairment (note 18)   (11)
Acquisition of subsidiary   1
Translation adjustment (6) 2
Balance at end of year 76 76
Research and development project and patents    
Changes in intangibles    
Balance at beginning of year 684  
Acquisition of subsidiary   724
Translation adjustment (153) (40)
Balance at end of year 531 684
Carrying amount    
Changes in intangibles    
Balance at beginning of year 10,539  
Balance at end of year 11,067 10,539
Carrying amount | Goodwill    
Changes in intangibles    
Balance at beginning of year 3,629  
Balance at end of year 3,298 3,629
Carrying amount | Railways concessions    
Changes in intangibles    
Balance at beginning of year 5,090  
Balance at end of year 6,393 5,090
Carrying amount | Contract right    
Changes in intangibles    
Balance at beginning of year 248  
Balance at end of year 102 248
Carrying amount | Software    
Changes in intangibles    
Balance at beginning of year 888  
Balance at end of year 743 888
Carrying amount | Research and development project and patents    
Changes in intangibles    
Balance at beginning of year 684  
Balance at end of year 531 684
Accumulated amortization    
Changes in intangibles    
Balance at beginning of year (2,040)  
Balance at end of year (1,771) (2,040)
Accumulated amortization | Railways concessions    
Changes in intangibles    
Balance at beginning of year (1,120)  
Balance at end of year (1,002) (1,120)
Accumulated amortization | Contract right    
Changes in intangibles    
Balance at beginning of year (108)  
Balance at end of year (102) (108)
Accumulated amortization | Software    
Changes in intangibles    
Balance at beginning of year (812)  
Balance at end of year $ (667) $ (812)