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DEBT (Debt Obligations) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total principal amount of debt obligations $ 8,344.7 $ 8,076.1
Unamortized discount (6.0) (6.2)
Current maturities of long-term debt (300.0) (300.0)
Unamortized Debt Issuance Expense (41.0) (41.5)
Total long term debt $ 7,997.7 7,728.4
0.013% Credit Facilities due 2017 To 2020 [Member]    
Debt Instrument [Line Items]    
Maturity date, start Dec. 31, 2017  
Maturity date, end Dec. 31, 2020  
8.050% Junior subordinated notes due 2067 [Member]    
Debt Instrument [Line Items]    
Maturity date Dec. 31, 2067  
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Interest Rate (in percentage) [1] 1.378%  
Total principal amount of debt obligations [1] $ 189.7 326.1
Credit Facilities [Member]    
Debt Instrument [Line Items]    
Interest Rate (in percentage) 1.686%  
Total principal amount of debt obligations $ 1,565.0 1,110.0
Credit Facilities [Member] | Midcoast Energy Partners [Member]    
Debt Instrument [Line Items]    
Interest Rate (in percentage) 2.691%  
Total principal amount of debt obligations $ 440.0 490.0
Senior Notes [Member] | 5.875% Senior Notes due December 2016 [Member]    
Debt Instrument [Line Items]    
Maturity date Dec. 31, 2016  
Interest Rate (in percentage) 5.875%  
Total principal amount of debt obligations $ 300.0 300.0
Senior Notes [Member] | 6.500% Senior Notes due April 2018 [Member]    
Debt Instrument [Line Items]    
Maturity date Apr. 30, 2018  
Interest Rate (in percentage) 6.50%  
Total principal amount of debt obligations $ 400.0 400.0
Senior Notes [Member] | 9.875% Senior Notes due March 2019 [Member]    
Debt Instrument [Line Items]    
Maturity date Mar. 31, 2019  
Interest Rate (in percentage) 9.875%  
Total principal amount of debt obligations $ 500.0 500.0
Senior Notes [Member] | 5.200% Senior Notes due March 2020 [Member]    
Debt Instrument [Line Items]    
Maturity date Mar. 31, 2020  
Interest Rate (in percentage) 5.20%  
Total principal amount of debt obligations $ 500.0 500.0
Senior Notes [Member] | 4.375% Senior Notes due October 2020 [Member]    
Debt Instrument [Line Items]    
Maturity date Oct. 31, 2020  
Interest Rate (in percentage) 4.375%  
Total principal amount of debt obligations $ 500.0 500.0
Senior Notes [Member] | 4.200% Senior Notes due September 2021 [Member]    
Debt Instrument [Line Items]    
Maturity date Sep. 30, 2021  
Interest Rate (in percentage) 4.20%  
Total principal amount of debt obligations $ 600.0 600.0
Senior Notes [Member] | 5.875% Senior Notes due October 2025 [Member]    
Debt Instrument [Line Items]    
Maturity date Oct. 31, 2025  
Interest Rate (in percentage) 5.875%  
Total principal amount of debt obligations $ 500.0 500.0
Senior Notes [Member] | 5.950% Senior Notes due June 2033 [Member]    
Debt Instrument [Line Items]    
Maturity date Jun. 30, 2033  
Interest Rate (in percentage) 5.95%  
Total principal amount of debt obligations $ 200.0 200.0
Senior Notes [Member] | 6.300% Senior Notes due December 2034    
Debt Instrument [Line Items]    
Maturity date Dec. 31, 2034  
Interest Rate (in percentage) 6.30%  
Total principal amount of debt obligations $ 100.0 100.0
Senior Notes [Member] | 7.500% Senior Notes due April 2038 [Member]    
Debt Instrument [Line Items]    
Maturity date Apr. 30, 2038  
Interest Rate (in percentage) 7.50%  
Total principal amount of debt obligations $ 400.0 400.0
Senior Notes [Member] | 5.500% Senior Notes due September 2040 [Member]    
Debt Instrument [Line Items]    
Maturity date Sep. 30, 2040  
Interest Rate (in percentage) 5.50%  
Total principal amount of debt obligations $ 550.0 550.0
Senior Notes [Member] | 7.375% Senior Notes due October 2045 [Member]    
Debt Instrument [Line Items]    
Maturity date Oct. 31, 2045  
Interest Rate (in percentage) 7.375%  
Total principal amount of debt obligations $ 600.0 600.0
Senior Notes [Member] | 8.050% Junior subordinated notes due 2067 [Member]    
Debt Instrument [Line Items]    
Interest Rate (in percentage) 8.05%  
Total principal amount of debt obligations $ 400.0 400.0
Senior Notes [Member] | 7.000% Senior Notes due October 2018 [Member]    
Debt Instrument [Line Items]    
Maturity date Oct. 31, 2018  
Interest Rate (in percentage) 7.00%  
Total principal amount of debt obligations $ 100.0 100.0
Senior Notes [Member] | 7.125% Senior Notes due October 2028 [Member]    
Debt Instrument [Line Items]    
Maturity date Oct. 31, 2028  
Interest Rate (in percentage) 7.125%  
Total principal amount of debt obligations $ 100.0 100.0
Senior Notes [Member] | 3.560% Series A Senior Notes due September 2019 [Member] | Midcoast Energy Partners [Member]    
Debt Instrument [Line Items]    
Maturity date Sep. 30, 2019  
Interest Rate (in percentage) 3.56%  
Total principal amount of debt obligations $ 75.0 75.0
Senior Notes [Member] | 4.040% Series B Senior Notes due September 2021 [Member] | Midcoast Energy Partners [Member]    
Debt Instrument [Line Items]    
Maturity date Sep. 30, 2021  
Interest Rate (in percentage) 4.04%  
Total principal amount of debt obligations $ 175.0 175.0
Senior Notes [Member] | 4.420% Series C Senior Notes due September 2024 [Member] | Midcoast Energy Partners [Member]    
Debt Instrument [Line Items]    
Maturity date Sep. 30, 2024  
Interest Rate (in percentage) 4.42%  
Total principal amount of debt obligations $ 150.0 150.0
Other Long-term Debt [Member]    
Debt Instrument [Line Items]    
Current maturities of long-term debt $ (300.0) $ (300.0)
[1] Individual issuances of commercial paper generally mature in 90 days or less, but are supported by our Credit Facilities and are therefore considered long-term debt.