Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Narrative) (Details)

v3.2.0.727
Long-Term Debt (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Apr. 15, 2015
Mar. 09, 2015
Debt Instrument [Line Items]            
Loss on extinguishment of debt $ (21,000,000) $ 0 $ (21,000,000) $ 0    
Line of credit facility maximum borrowing capacity           $ 2,250,000,000
Line of credit facility standby letter of credit           250,000,000
Line of credit facility uncommitted loan           $ 1,500,000,000
Debt instrument lower range of basis spread on variable rate           0.25%
Debt instrument higher range of basis spread on variable rate           1.75%
Line of credit facility remaining borrowing capacity $ 1,400,000,000   $ 1,400,000,000      
Line of credit facility interest rate at period end 1.60%   1.60%      
Debt weighted average interest rate 4.10%   4.10%      
7.375% Senior Secured Notes due 2020            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount         $ 500,000,000  
Debt instrument interest rate stated percentage 7.375%   7.375%   7.375%  
Debt Instrument, Repurchase Price Including Premium         $ 1,036.88  
Debt Insturment, Face Value of Individual Bonds Repurchased         $ 1,000