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Incentive and Deferred Compensation Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Long-term incentive plan
     
Incentive and deferred compensation plans      
Vesting period of performance and/or service condition(s) (in years and/or months) 3 years    
Maximum dollar amount which may be received by any single participant during any specified period $ 3,000,000    
Compensation cost related to share-based compensation plan awards 8,000,000 5,000,000 9,000,000
Tax benefits recognized in income related to award expense 3,000,000 2,000,000 3,000,000
Total unrecognized compensation cost for non-vested LTIP awards related to open performance periods 9,000,000    
Expected period of recognition related to unrecognized compensation cost (in years) 2 years    
Long-term incentive plan | Class A
     
Incentive and deferred compensation plans      
Maximum number of shares authorized for grant (in shares) 1,000,000    
Maximum number of shares which may be received by any single participant during any specified period (in shares) 250,000    
Long-term incentive plan | 2011-2013 performance period | Class A
     
Incentive and deferred compensation plans      
Compensation cost related to share-based compensation plan awards 6,000,000    
Long-term incentive plan | 2010-2012 performance period
     
Incentive and deferred compensation plans      
Compensation cost related to share-based compensation plan awards   5,000,000  
Long-term incentive plan | 2009-2011 performance period
     
Incentive and deferred compensation plans      
Compensation cost related to share-based compensation plan awards     5,000,000
Equity compensation plan
     
Incentive and deferred compensation plans      
Compensation cost related to share-based compensation plan awards 0    
Equity compensation plan | Class A
     
Incentive and deferred compensation plans      
Maximum number of shares authorized for grant (in shares) 100,000    
Maximum number of shares which may be received by any single participant during any specified period (in shares) 5,000    
Stock compensation plan for outside directors | Class A
     
Incentive and deferred compensation plans      
Compensation cost related to share-based compensation plan awards $ 1,000,000 $ 500,000 $ 1,000,000
Stock compensation plan for outside directors | Three month vesting period | Class A
     
Incentive and deferred compensation plans      
Vesting period of performance and/or service condition(s) (in years and/or months) 3 months    
Vesting percent of the grant in Class A common stock (as a percent) 25.00%