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Debt (Components Of Debt) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Jul. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Jan. 31, 2015
Debt Instrument [Line Items]                
Debt Instrument $ 4,685   $ 4,685   $ 4,685   $ 4,733  
Unamortized Issuance Cost (30)   (30)   (30)   (24)  
Unamortized Debt Discount (3)   (3)   (3)   (4)  
Total 4,652   4,652   4,652   4,705  
Payments on long-term debt         1,175 $ 500    
Short-term Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument 1   1   1   1  
Unamortized Issuance Cost          
Unamortized Debt Discount          
Total 1   1   1   1  
Short-term Debt [Member] | 7.15% Senior Notes due June 2018 [Member]                
Debt Instrument [Line Items]                
Debt Instrument 1   1   1   1  
Unamortized Issuance Cost          
Unamortized Debt Discount          
Total $ 1   $ 1   $ 1   $ 1  
Stated interest rate 7.15%   7.15%   7.15%   7.15%  
Maturity date, year and month         2018-06   2018-06  
Long-term Debt [Member]                
Debt Instrument [Line Items]                
Debt Instrument $ 4,684   $ 4,684   $ 4,684   $ 4,732  
Unamortized Issuance Cost (30)   (30)   (30)   (24)  
Unamortized Debt Discount (3)   (3)   (3)   (4)  
Total 4,651   4,651   4,651   4,704  
Long-term Debt [Member] | Credit Facility [Member]                
Debt Instrument [Line Items]                
Debt Instrument             116  
Total             $ 116  
Credit facility, variable interest rate             1.886%  
Credit facility, maturity date             Dec. 01, 2018  
Long-term Debt [Member] | 7.35% Senior Notes due October 2017 [Member]                
Debt Instrument [Line Items]                
Debt Instrument 15   15   15   $ 15  
Unamortized Issuance Cost          
Unamortized Debt Discount          
Total $ 15   $ 15   $ 15   $ 15  
Stated interest rate 7.35%   7.35%   7.35%   7.35%  
Maturity date, year and month         2017-10   2017-10  
Long-term Debt [Member] | 7.125% Senior Notes due October 2017 [Member]                
Debt Instrument [Line Items]                
Debt Instrument $ 25   $ 25   $ 25   $ 25  
Unamortized Issuance Cost          
Unamortized Debt Discount          
Total $ 25   $ 25   $ 25   $ 25  
Stated interest rate 7.125%   7.125%   7.125%   7.125%  
Maturity date, year and month         2017-10   2017-10  
Long-term Debt [Member] | 3.30% Senior Notes due January 2018 [Member]                
Debt Instrument [Line Items]                
Debt Instrument $ 38   $ 38   $ 38   $ 350  
Unamortized Issuance Cost       (2)  
Unamortized Debt Discount          
Total $ 38   $ 38   $ 38   $ 348  
Stated interest rate 3.30% 5.05% 3.30%   3.30%   3.30% 3.30%
Maturity date, year and month         2018-01   2018-01  
Payments on long-term debt   $ 312            
Long-term Debt [Member] | 7.50% Senior Notes due February 2018 [Member]                
Debt Instrument [Line Items]                
Debt Instrument $ 212   $ 212   $ 212   $ 600  
Unamortized Issuance Cost       (2)  
Unamortized Debt Discount          
Total $ 212   $ 212   $ 212   $ 598  
Stated interest rate 7.50%   7.50%   7.50%   7.50%  
Maturity date, year and month         2018-02   2018-02  
Payments on long-term debt   $ 388            
Long-term Debt [Member] | 7.15% Senior Notes due June 2018 [Member]                
Debt Instrument [Line Items]                
Debt Instrument $ 26   $ 26   $ 26   $ 26  
Unamortized Issuance Cost          
Unamortized Debt Discount          
Total $ 26   $ 26   $ 26   $ 26  
Stated interest rate 7.15%   7.15%   7.15%   7.15%  
Maturity date, year and month         2018-06   2018-06  
Long-term Debt [Member] | 4.05% Senior Notes due January 2020 [Member]                
Debt Instrument [Line Items]                
Debt Instrument $ 850   $ 850   $ 850   $ 850  
Unamortized Issuance Cost (5)   (5)   (5)   (5)  
Unamortized Debt Discount       (1)  
Total $ 845   $ 845   $ 845   $ 844  
Stated interest rate 4.05% 5.80% 4.05%   4.05%   4.05% 4.05%
Maturity date, year and month         2020-01   2020-01  
Long-term Debt [Member] | 4.10% Senior Notes due March 2022 [Member]                
Debt Instrument [Line Items]                
Debt Instrument $ 1,000   $ 1,000   $ 1,000   $ 1,000  
Unamortized Issuance Cost (5)   (5)   (5)   (5)  
Unamortized Debt Discount (1)   (1)   (1)   (1)  
Total $ 994   $ 994   $ 994   $ 994  
Stated interest rate 4.10%   4.10%   4.10%   4.10%  
Maturity date, year and month         2022-03   2022-03  
Long-term Debt [Member] | 4.95% Senior Notes due January 2025 [Member]                
Debt Instrument [Line Items]                
Debt Instrument $ 1,000   $ 1,000   $ 1,000   $ 1,000  
Unamortized Issuance Cost (7)   (7)   (7)   (7)  
Unamortized Debt Discount (2)   (2)   (2)   (2)  
Total $ 991   $ 991   $ 991   $ 991  
Stated interest rate 4.95% 6.70% 4.95%   4.95%   4.95% 4.95%
Maturity date, year and month         2025-01   2025-01  
Long-term Debt [Member] | Term Loan due December 2020 [Member]                
Debt Instrument [Line Items]                
Debt Instrument $ 327   $ 327   $ 327      
Unamortized Issuance Cost (2)   (2)   (2)      
Unamortized Debt Discount          
Total 325   325   $ 325      
Variable interest rate         2.96%      
Maturity date, year and month         2020-12      
Long-term Debt [Member] | 2015 Term Facility [Member]                
Debt Instrument [Line Items]                
Debt Instrument 750   $ 750   $ 750   $ 750  
Unamortized Issuance Cost             (3)  
Total             $ 747  
Variable interest rate             1.775%  
Maturity date, year and month     2020-12 2018-11     2018-11  
Payments on long-term debt 48 $ 375            
Long-term Debt [Member] | Term Loan due December 2020 [Member]                
Debt Instrument [Line Items]                
Debt Instrument 1,191   $ 1,191 $ 1,191 1,191      
Unamortized Issuance Cost (11)   (11)   (11)      
Unamortized Debt Discount          
Total $ 1,180   $ 1,180   $ 1,180      
Variable interest rate         2.96%      
Maturity date, year and month         2020-12      
Long-term Debt [Member] | 2020 Senior Notes [Member]                
Debt Instrument [Line Items]                
Accelerated maturity date, year and month if not amended, redeemed or refinanced         2019-10      
Amount to be amended, redeemed or refinanced to avoid acceleration         $ 765      
Senior Notes [Member]                
Debt Instrument [Line Items]                
Unamortized Issuance Cost   $ (2)            
Over LIBOR [Member] | Senior Notes [Member]                
Debt Instrument [Line Items]                
Increase in basis spread   1.75%