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Long-term Incentive Compensation and Shareholders’ Equity - Summary of Status of Awards Under Stock-Based Compensation Plans and Agreements (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock appreciation rights      
Awards      
Outstanding at beginning of year (in shares) 6,163,000    
Granted (in shares) 2,389,000    
Exercised (in shares) (20,000)    
Expired (in shares) (1,058,000)    
Canceled (in shares) (521,000)    
Outstanding at end of period (in shares) 6,953,000 6,163,000  
Exercisable at end of period (in shares) 1,254,000    
Weighted-average fair value of grants $ 14.04 $ 16.24 $ 14.51
Weighted average exercise price      
Outstanding at beginning of year (USD per share) 69.90    
Granted (USD per share) 52.45    
Exercised (USD per share) 64.17    
Expired (USD per share) 70.97    
Canceled (USD per share) 65.23    
Outstanding at end of period (USD per share) 64.10 $ 69.90  
Exercisable at end of period (USD per share) $ 77.68    
Weighted average remaining contractual life      
Outstanding at end of period (1) 3 years    
Exercisable at end of period 1 year 1 month 6 days    
Stock units      
Awards      
Outstanding at beginning of year (in shares) 1,860,000    
Granted (in shares) 1,961,000    
Exercised (in shares) (225,000)    
Expired (in shares) 0    
Canceled (in shares) (436,000)    
Outstanding at end of period (in shares) 3,160,000 1,860,000  
Exercisable at end of period (in shares) 0    
Weighted-average fair value of grants (USD per share) $ 50.58 $ 66.23 $ 65.73
Weighted average remaining contractual life      
Outstanding at end of period (1) 2 years 3 months 18 days    
Exercisable at end of period 0 years    
Performance stock units | Share-based Payment Arrangement, Tranche One      
Awards      
Granted (in shares) 8