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Retained Earnings and Accumulated Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated at beginning $ 3,961,784    
Reclassifications     $ (5,262,577)
Accumulated at ending 4,599,147 $ 3,961,784  
Accumulated Other Comprehensive Income      
Accumulated at beginning 3,961,784 5,257,554 5,679,063
Changes in other comprehensive income 637,363 (1,295,770) 3,262,294
Reclassifications     (3,683,803)
Accumulated at ending 4,599,147 3,961,784 5,257,554
Available For-Sale Investments      
Accumulated at beginning 2,741,983 2,774,362 7,392,871
Changes in other comprehensive income 1,008,675 (32,379) 644,068
Reclassifications     (5,262,577)
Accumulated at ending 3,750,658 2,741,983 2,774,362
Warrants Issued by UHI      
Accumulated at beginning (332,217) 3,303,182  
Changes in other comprehensive income (280,447) (3,635,399) 3,303,182
Accumulated at ending (612,664) (332,217) 3,303,182
Exchange Differences      
Accumulated at beginning 1,263,349 603,168 185,963
Changes in other comprehensive income 387,698 660,181 417,205
Accumulated at ending 1,651,047 1,263,349 603,168
Remeasurement of Post-employment Benefit Obligations      
Accumulated at beginning (381,794) (126,845) 35,422
Changes in other comprehensive income (283,945) (254,949) (162,267)
Accumulated at ending (665,739) (381,794) (126,845)
Cash Flow Hedges      
Accumulated at beginning 570,259 (218,949) (244,787)
Changes in other comprehensive income 231,758 789,208 25,838
Accumulated at ending 802,017 570,259 (218,949)
Share of Equity Accounts      
Accumulated at beginning 268,397 311,229 291,524
Changes in other comprehensive income (60,340) (42,832) 19,705
Accumulated at ending 208,057 268,397 311,229
Income Tax      
Accumulated at beginning (168,193) (1,388,593) (1,981,930)
Changes in other comprehensive income (366,036) 1,220,400 (985,437)
Reclassifications     1,578,774
Accumulated at ending $ (534,229) $ (168,193) $ (1,388,593)