Quarterly report pursuant to Section 13 or 15(d)

Debt (Details 4)

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Debt (Details 4)
6 Months Ended 12 Months Ended 18 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
Dec. 31, 2014
a
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]            
Borrowings of debt   $ 1,343,000,000 $ 1,948,000,000      
ANLBC            
Debt Instrument [Line Items]            
Area of land aquired (in acres) | a       82    
Number of credit facilities | item   2        
ANLBC | Cobb County Major League Baseball Ballpark            
Debt Instrument [Line Items]            
Construction and Development Costs         $ 169,000,000  
Line of Credit Facility, Maximum Borrowing Capacity $ 350,000,000 $ 350,000,000     350,000,000  
ANLBC | Cobb County Major League Baseball Ballpark | Revolving Credit Facility            
Debt Instrument [Line Items]            
Borrowings of debt 185,000,000          
ANLBC | Forecast | Cobb County Major League Baseball Ballpark            
Debt Instrument [Line Items]            
Construction and Development Costs 672,000,000          
Other costs and equipment 50,000,000          
ANLBC | Forecast | Cobb County Ballpark Mixed Use Development            
Debt Instrument [Line Items]            
Construction and Development Costs 452,000,000          
Construction and development costs funded by ANLBC affiliated entities 363,000,000          
ANLBC | Cobb Marietta Coliseum And Exhibit Hall Authority | Cobb County Major League Baseball Ballpark            
Debt Instrument [Line Items]            
Due from affiliate $ 392,000,000 $ 392,000,000     $ 392,000,000  
Cobb Marietta Coliseum And Exhibit Hall Authority | Forecast | Cobb County Major League Baseball Ballpark | Bonds Payable            
Debt Instrument [Line Items]            
Debt issuance amount           $ 368,000,000