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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Schedule of Effect of Adoption of IFRS 9 in Retained Earnings and Other Components of Equity (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Assets            
Deferred tax assets $ 111,186,768 $ 5,649   $ 116,571,349 $ 112,651,699  
Total assets 1,429,223,392 72,613   1,486,211,852 1,515,042,274  
Equity            
Retained earnings 237,255,485 12,053   171,087,598    
Total adjustment on equity $ 245,872,422 $ 12,492   $ 260,633,517 $ 271,023,767 $ 160,854,186
Adjustments [member]            
Assets            
Trade receivables     $ (2,400,783)      
Deferred tax assets     544,628      
Total assets     (1,856,155)      
Equity            
Retained earnings     (1,856,155)      
Total adjustment on equity     $ (1,856,155)