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Property, Machinery and Equipment, Net - Disclosure of Net Change in Property, Machinery and Equipment (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period $ 230,134 $ 216,694 $ 205,542
Capital expenditures 9,514 12,676 11,454
Additions through capital leases 2,096 7 63
Capitalization of financial expense   175 73
Stripping costs 809 421 723
Total capital expenditures 12,419 13,279 12,313
Disposals (1,844) (1,841) (2,247)
Reclassifications (1,634) (4,549) (3,099)
Business combinations 6,492 0 4,004
Depreciation and depletion for the period (13,955) (14,041) (13,086)
Impairment losses (984) (1,899) (1,145)
Foreign currency translation effects 1,532 22,491 14,412
Net book value at end of period 232,160 230,134 216,694
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period 395,922 360,089 324,210
Net book value at end of period 411,515 395,922 360,089
Accumulated depreciation and depletion [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period (165,788) (143,395) (118,668)
Net book value at end of period (179,355) (165,788) (143,395)
Land and mineral reserves [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period 80,917 74,226  
Capital expenditures 547 2,149  
Additions through capital leases 0 0  
Capitalization of financial expense   0  
Stripping costs 809 421  
Total capital expenditures 1,356 2,570  
Disposals (347) (388)  
Reclassifications (784) (2,029)  
Business combinations 2,179 0  
Depreciation and depletion for the period (2,571) (2,426)  
Impairment losses (202) (671)  
Foreign currency translation effects (1,895) 9,635  
Net book value at end of period 78,653 80,917 74,226
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 97,218 86,441  
Net book value at end of period 95,495 97,218 86,441
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 (16,301) (12,215)  
Net book value at end of period (16,842) (16,301) (12,215)
Building [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period 27,516 27,335  
Capital expenditures 802 1,856  
Additions through capital leases 0 0  
Capitalization of financial expense   0  
Stripping costs 0 0  
Total capital expenditures 802 1,856  
Disposals (223) (141)  
Reclassifications (82) (703)  
Business combinations 749 0  
Depreciation and depletion for the period (1,967) (2,033)  
Impairment losses (1) (303)  
Foreign currency translation effects 908 1,505  
Net book value at end of period 27,702 27,516 27,335
Building [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period 51,740 48,563  
Net book value at end of period 53,927 51,740 48,563
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 (24,224) (21,228)  
Net book value at end of period (26,225) (24,224) (21,228)
Machinery and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period 104,454 101,280  
Capital expenditures 8,165 8,671  
Additions through capital leases 2,096 7  
Capitalization of financial expense   0  
Stripping costs 0 0  
Total capital expenditures 10,261 8,678  
Disposals (1,274) (1,268)  
Reclassifications (768) (1,731)  
Business combinations 3,136 0  
Depreciation and depletion for the period (9,417) (9,582)  
Impairment losses (763) (547)  
Foreign currency translation effects 719 7,624  
Net book value at end of period 106,348 104,454 101,280
Machinery and equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period 229,717 211,232  
Net book value at end of period 242,636 229,717 211,232
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 (125,263) (109,952)  
Net book value at end of period (136,288) (125,263) (109,952)
Construction in progress [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period 17,247 13,853  
Capital expenditures 0 0  
Additions through capital leases 0 0  
Capitalization of financial expense   175  
Stripping costs 0 0  
Total capital expenditures 0 175  
Disposals 0 (44)  
Reclassifications 0 (86)  
Business combinations 428 0  
Depreciation and depletion for the period 0 0  
Impairment losses (18) (378)  
Foreign currency translation effects 1,800 3,727  
Net book value at end of period 19,457 17,247 13,853
Construction in progress [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period 17,247 13,853  
Net book value at end of period 19,457 17,247 13,853
Construction in progress [member] | Accumulated depreciation and depletion [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Net book value at beginning of period 0 0  
Net book value at end of period $ 0 $ 0 $ 0