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Property, Machinery and Equipment, Net and Assets For The Right-Of-Use, Net - Disclosure of Net Change in Property, Machinery and Equipment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | $ 10,565 | $ 11,232 | $ 11,588
Capital expenditures | 564 | 737 | 630
Stripping costs | 18 | 22 | 38
Total capital expenditures | 582 | 759 | 668
Disposals | (63) | (96) | (49)
Reclassifications | (88) | (402) | 6
Business combinations | 11 |  | 6
Depreciation and depletion for the period | (748) | (633) | (657)
Impairment losses | (306) | (64) | (23)
Foreign currency translation effects | 217 | (231) | (307)
Net book value at end of period | 10,170 | 10,565 | 11,232
Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | 19,708 | 20,642 | 20,653
Net book value at end of period | 20,296 | 19,708 | 20,642
Accumulated depreciation and depletion [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | (9,143) | (9,410) | (9,065)
Net book value at end of period | (10,126) | (9,143) | (9,410)
Land and mineral reserves [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | 3,638 | 3,831 |
Capital expenditures | 47 | 46 |
Stripping costs | 18 | 22 |
Total capital expenditures | 65 | 68 |
Disposals | (26) | (38) |
Reclassifications | (31) | (163) |
Depreciation and depletion for the period | (134) | (121) |
Impairment losses | (87) | (18) |
Foreign currency translation effects | 139 | 79 |
Net book value at end of period | 3,564 | 3,638 | 3,831
Land and mineral reserves [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | 4,606 | 4,789 |
Net book value at end of period | 4,741 | 4,606 | 4,789
Land and mineral reserves [member] | Accumulated depreciation and depletion [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | (968) | (958) |
Net book value at end of period | (1,177) | (968) | (958)
Building [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | 1,048 | 1,262 |
Capital expenditures | 35 | 28 |
Total capital expenditures | 35 | 28 |
Disposals | (7) | (8) |
Reclassifications | (1) | (23) |
Depreciation and depletion for the period | (99) | (61) |
Impairment losses | (54) | (17) |
Foreign currency translation effects | 42 | (133) |
Net book value at end of period | 964 | 1,048 | 1,262
Building [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | 2,374 | 2,633 |
Net book value at end of period | 2,438 | 2,374 | 2,633
Building [member] | Accumulated depreciation and depletion [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | (1,326) | (1,371) |
Net book value at end of period | (1,474) | (1,326) | (1,371)
Machinery and equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | 4,670 | 5,104 |
Capital expenditures | 482 | 663 |
Total capital expenditures | 482 | 663 |
Disposals | (30) | (50) |
Reclassifications | (56) | (203) |
Business combinations | 11 |  |
Depreciation and depletion for the period | (515) | (451) |
Impairment losses | (165) | (29) |
Foreign currency translation effects | 57 | (364) |
Net book value at end of period | 4,454 | 4,670 | 5,104
Machinery and equipment [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | 11,519 | 12,185 |
Net book value at end of period | 11,929 | 11,519 | 12,185
Machinery and equipment [member] | Accumulated depreciation and depletion [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | (6,849) | (7,081) |
Net book value at end of period | (7,475) | (6,849) | (7,081)
Construction in progress [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | 1,209 | 1,035 |
Reclassifications |  | (13) |
Foreign currency translation effects | (21) | 187 |
Net book value at end of period | 1,188 | 1,209 | 1,035
Construction in progress [member] | Cost [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Net book value at beginning of period | 1,209 | 1,035 |
Net book value at end of period | $ 1,188 | $ 1,209 | $ 1,035

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