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Information by business segment and geographic area (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Net operating revenue $ 38,056 $ 41,784 $ 43,839
Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 24,805 27,760 28,188
Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 5,921 5,803 6,256
Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 718 516 472
Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 31,444 34,079 34,916
Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 3,666 5,193 6,619
Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,805 2,376 1,779
Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 141 136 525
Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 6,612 7,569 8,398
Country Of China [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 19,375 22,210 22,824
Country Of China [Member] | Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 18,157 21,061 21,021
Country Of China [Member] | Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2 41
Country Of China [Member] | Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 7
Country Of China [Member] | Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 18,157 21,063 21,069
Country Of China [Member] | Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 432 693 1,627
Country Of China [Member] | Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 717 454 128
Country Of China [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 69
Country Of China [Member] | Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 1,218 1,147 1,755
Country Of Japan [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 3,050 3,219 3,535
Country Of Japan [Member] | Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,380 2,356 2,557
Country Of Japan [Member] | Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 278 279 208
Country Of Japan [Member] | Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2 1
Country Of Japan [Member] | Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,660 2,636 2,765
Country Of Japan [Member] | Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 360 583 765
Country Of Japan [Member] | Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 5
Country Of Japan [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 30
Country Of Japan [Member] | Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 390 583 770
Asia Except Japan And China [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,887 2,675 2,498
Asia Except Japan And China [Member] | Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,040 1,691 1,552
Asia Except Japan And China [Member] | Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 378 407 393
Asia Except Japan And China [Member] | Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 11 10 13
Asia Except Japan And China [Member] | Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,429 2,108 1,958
Asia Except Japan And China [Member] | Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 381 462 395
Asia Except Japan And China [Member] | Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 77 105 98
Asia Except Japan And China [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 47
Asia Except Japan And China [Member] | Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 458 567 493
Country Of Brazil [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 3,565 3,755 4,137
Country Of Brazil [Member] | Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 1,085 1,370 1,305
Country Of Brazil [Member] | Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 1,706 1,684 1,997
Country Of Brazil [Member] | Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 704 502 447
Country Of Brazil [Member] | Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 3,495 3,556 3,749
Country Of Brazil [Member] | Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 50 63 60
Country Of Brazil [Member] | Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue
Country Of Brazil [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 20 136 328
Country Of Brazil [Member] | Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 70 63 60
Country Of United States Of America [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 1,075 1,623 1,643
Country Of United States Of America [Member] | Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 26
Country Of United States Of America [Member] | Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 172 262 218
Country Of United States Of America [Member] | Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue
Country Of United States Of America [Member] | Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 198 262 218
Country Of United States Of America [Member] | Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 855 1,361 1,425
Country Of United States Of America [Member] | Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue
Country Of United States Of America [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 22
Country Of United States Of America [Member] | Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 877 1,361 1,425
Americas Except United States And Brazil [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 970 897 1,199
Americas Except United States And Brazil [Member] | Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 1
Americas Except United States And Brazil [Member] | Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 443 398 472
Americas Except United States And Brazil [Member] | Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 1 1 5
Americas Except United States And Brazil [Member] | Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 444 400 477
Americas Except United States And Brazil [Member] | Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 429 456 597
Americas Except United States And Brazil [Member] | Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 97 41
Americas Except United States And Brazil [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 125
Americas Except United States And Brazil [Member] | Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 526 497 597
Country Of Germany [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 1,467 1,351 1,521
Country Of Germany [Member] | Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 316 244 357
Country Of Germany [Member] | Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 188 55 16
Country Of Germany [Member] | Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2
Country Of Germany [Member] | Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 504 301 373
Country Of Germany [Member] | Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 401 458 597
Country Of Germany [Member] | Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 562 592 551
Country Of Germany [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue
Country Of Germany [Member] | Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 963 1,050 1,148
Europe Except Germany [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 3,019 3,677 3,836
Europe Except Germany [Member] | Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 794 1,037 1,396
Europe Except Germany [Member] | Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 146 374 317
Europe Except Germany [Member] | Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue
Europe Except Germany [Member] | Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 940 1,411 1,713
Europe Except Germany [Member] | Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 727 1,082 1,126
Europe Except Germany [Member] | Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 1,352 1,184 997
Europe Except Germany [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue
Europe Except Germany [Member] | Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,079 2,266 2,123
Middle East Africa And Oceania [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,648 2,377 2,646
Middle East Africa And Oceania [Member] | Iron Ore [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 7
Middle East Africa And Oceania [Member] | Iron Ore Pellets [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,610 2,342 2,594
Middle East Africa And Oceania [Member] | Other Ferrous Products And Services [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue
Middle East Africa And Oceania [Member] | Iron Solutions [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 2,617 2,342 2,594
Middle East Africa And Oceania [Member] | Nickel And Other Products [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 31 35 27
Middle East Africa And Oceania [Member] | Copper [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue
Middle East Africa And Oceania [Member] | Other [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue 25
Middle East Africa And Oceania [Member] | Energy Transition Metals [Member]      
IfrsStatementLineItems [Line Items]      
Net operating revenue $ 31 $ 35 $ 27