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DEBT (Debt Obligations) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Oct. 06, 2015
Debt Instrument [Line Items]      
Total principal amount of debt obligations $ 7,927.6 $ 8,076.1  
Unamortized discount (6.2) (6.2)  
Current maturities of long-term debt 0.0 (300.0)  
Unamortized debt issuance costs (37.0) (41.5)  
Total long term debt $ 7,884.4 7,728.4  
Commercial Paper [Member]      
Debt Instrument [Line Items]      
Interest Rate (in percentage) [1] 1.656%    
Total principal amount of debt obligations [1] $ 392.5 326.1  
Credit Facilities [Member]      
Debt Instrument [Line Items]      
Maturity date, start Dec. 31, 2018    
Maturity date, end Dec. 31, 2020    
Interest Rate (in percentage) 1.919%    
Total principal amount of debt obligations $ 1,265.1 1,110.0  
Credit Facilities [Member] | Midcoast Energy Partners [Member]      
Debt Instrument [Line Items]      
Interest Rate (in percentage) 2.99%    
Total principal amount of debt obligations $ 420.0 490.0  
Senior Notes [Member]      
Debt Instrument [Line Items]      
Total principal amount of debt obligations $ 200.0   $ 1,600.0
Unamortized discount   (6.2)  
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 $ 0.0 300.0  
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] | 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]      
Debt Instrument [Line Items]      
Maturity date Sep. 30, 2019    
Senior Notes [Member] | 3.560% Series A Senior Notes due September 2019 [Member] | Midcoast Energy Partners [Member]      
Debt Instrument [Line Items]      
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]      
Debt Instrument [Line Items]      
Maturity date Sep. 30, 2021    
Senior Notes [Member] | 4.040% Series B Senior Notes due September 2021 [Member] | Midcoast Energy Partners [Member]      
Debt Instrument [Line Items]      
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]      
Debt Instrument [Line Items]      
Maturity date Sep. 30, 2024    
Senior Notes [Member] | 4.420% Series C Senior Notes due September 2024 [Member] | Midcoast Energy Partners [Member]      
Debt Instrument [Line Items]      
Interest Rate (in percentage) 4.42%    
Total principal amount of debt obligations $ 150.0 150.0  
Junior Subordinated Notes [Member]      
Debt Instrument [Line Items]      
Maturity date Dec. 31, 2067    
Interest Rate (in percentage) 8.05%    
Total principal amount of debt obligations $ 400.0    
Junior Subordinated 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  
Other Long-term Debt [Member]      
Debt Instrument [Line Items]      
Interest Rate (in percentage) 5.875%    
Current maturities of long-term debt $ 0.0 $ (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.