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Capital Stock and Long-term Retention Plan - Reconciliation of shares (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of the number of shares outstanding    
Outstanding at beginning of period (in shares) 341,268,300 338,468,300
Acquired under share repurchase program (in shares) (633,600)  
Acquired by trust under LTRP (in shares) (3,267,300) (1,525,100)
Released (in shares) 4,969,700 4,325,100
Outstanding at end of period (in shares) 342,337,100 341,268,300
Series "D" Shares    
Reconciliation of the number of shares outstanding    
Outstanding at beginning of period (in shares) 85,592,100 84,859,500
Acquired under share repurchase program (in shares) (189,600)  
Acquired by trust under LTRP (in shares) (977,400) (456,200)
Released (in shares) 1,381,700 1,188,800
Outstanding at end of period (in shares) 85,806,800 85,592,100
Series "L" Shares    
Reconciliation of the number of shares outstanding    
Outstanding at beginning of period (in shares) 85,592,100 84,859,500
Acquired under share repurchase program (in shares) (189,600)  
Acquired by trust under LTRP (in shares) (977,400) (456,200)
Released (in shares) 1,381,700 1,188,800
Outstanding at end of period (in shares) 85,806,800 85,592,100
Series "A" Shares    
Reconciliation of the number of shares outstanding    
Outstanding at beginning of period (in shares) 116,283,300 115,409,000
Acquired under share repurchase program (in shares) (135,300)  
Acquired by trust under LTRP (in shares) (698,100) (325,900)
Released (in shares) 1,337,800 1,200,200
Outstanding at end of period (in shares) 116,787,700 116,283,300
Series "B" Shares    
Reconciliation of the number of shares outstanding    
Outstanding at beginning of period (in shares) 53,800,800 53,340,300
Acquired under share repurchase program (in shares) (119,100)  
Acquired by trust under LTRP (in shares) (614,400) (286,800)
Released (in shares) 868,500 747,300
Outstanding at end of period (in shares) 53,935,800 53,800,800
CPOs    
Reconciliation of the number of shares outstanding    
Outstanding at beginning of period (in shares) 2,445,500 2,424,600
Acquired under share repurchase program (in shares) (5,400)  
Acquired by trust under LTRP (in shares) (27,900) (13,100)
Released (in shares) 39,400 34,000
Outstanding at end of period (in shares) 2,451,600 2,445,500