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Debt (Details)
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 18, 2015
USD ($)
May. 26, 2015
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2013
USD ($)
Debt Instrument [Line Items]                
Total debt       $ 799,000,000     $ 799,000,000  
Less: short-term debt including current maturities       0     0  
Long-term debt $ 1,494,000,000   $ 1,494,000,000 799,000,000     799,000,000  
Annual long term debt maturity year one       0        
Annual long term debt maturity year two       0        
Annual long term debt maturity year three       0        
Annual long term debt maturity year four       400,000,000        
Annual long term debt maturity after year five       399,000,000        
Maximum borrowing capacity               $ 1,000,000,000.0
Facility expiration period   4 years            
Commercial paper       $ 0     0  
Commitment fee minimum percentage       0.20%        
Commitment fee maximum percentage       0.45%        
Current commitment fee       0.20%        
Indebtedness to cash flow       3.25        
4 Year Facility [Member]                
Debt Instrument [Line Items]                
Facility outstanding $ 0   0          
Term of debt instrument 4 years              
Maximum borrowing capacity $ 1,000,000,000.0   1,000,000,000.0          
5 Year Facility [Member]                
Debt Instrument [Line Items]                
Term of debt instrument 5 years              
Maximum borrowing capacity $ 1,200,000,000.0   $ 1,200,000,000.0          
Current commitment fee     0.20%          
5 Year Facility [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Current commitment fee     0.10%          
5 Year Facility [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Current commitment fee     0.20%          
Indebtedness to cash flow     4          
Commercial Paper [Member]                
Debt Instrument [Line Items]                
Short-term debt       $ 0     0  
Senior Notes One [Member]                
Debt Instrument [Line Items]                
Senior notes       $ 400,000,000     $ 400,000,000  
Interest rate       5.90%     5.90%  
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes)       $ 1,000,000        
Senior Notes Two [Member]                
Debt Instrument [Line Items]                
Senior notes       $ 399,000,000     $ 399,000,000  
Interest rate       6.55%     6.55%  
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes)       $ 1,000,000        
Senior Notes [Member]                
Debt Instrument [Line Items]                
Senior notes 1,494,000,000   $ 1,494,000,000 799,000,000        
Debt issued         $ 2,000,000,000      
Senior Notes [Member] | Senior Notes One [Member]                
Debt Instrument [Line Items]                
Senior notes $ 400,000,000   $ 400,000,000 $ 400,000,000        
Interest rate 5.90%   5.90% 5.90%        
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes) $ 1,000,000   $ 1,000,000          
Senior Notes [Member] | Senior Notes Two [Member]                
Debt Instrument [Line Items]                
Senior notes $ 695,000,000   $ 695,000,000 $ 0        
Debt issued           $ 700,000,000    
Interest rate 4.00%   4.00% 4.00%   4.00%    
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes) $ 5,000,000   $ 5,000,000          
Senior Notes [Member] | Senior Notes Three [Member]                
Debt Instrument [Line Items]                
Senior notes $ 399,000,000   $ 399,000,000 $ 399,000,000        
Interest rate 6.55%   6.55% 6.55%        
Unamortized debt discount on senior notes (less than $1 milllion for 5.9% Senior Notes) $ 1,000,000   $ 1,000,000          
Commercial Paper [Member]                
Debt Instrument [Line Items]                
Facility outstanding       $ 0        
Maximum borrowing capacity $ 1,000,000,000.0   $ 1,000,000,000.0