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Debt Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Principal outstanding $ 23,901.6 $ 22,738.5  
Other, non-principal amounts (203.9) (197.7)  
Less current maturities of debt (2,576.8) (1,863.9)  
Total long-term debt 21,120.9 20,676.9  
Debt Obligations Terms:      
Repayment of debt obligations 61,672.6 19,867.2 $ 14,341.1
Gains on early extinguishment of debt 0.0 1.6 0.0
Letters of credit outstanding for facilities and motor fuel tax obligations 66.4    
Unamortized debt issuance costs in current assets   14.7  
Unamortized debt issuance costs in other assets   135.1  
Total unamortized debt issuance costs   149.8  
Senior Debt Obligations [Member]      
Debt Instrument [Line Items]      
Principal outstanding 22,427.2 21,264.1  
Senior Debt Obligations [Member] | Commercial Paper Notes [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,777.2 1,114.1  
Debt Obligations Terms:      
Interest rate terms variable    
Maximum borrowing capacity $ 2,500.0    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 0.90%    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 0.56%    
Senior Debt Obligations [Member] | Commercial Paper Notes [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 1.18%    
Senior Debt Obligations [Member] | EPO Senior Notes AA [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.0 750.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.20%    
Maturity date Feb. 01, 2016    
Repayment of debt obligations $ 750.0    
Senior Debt Obligations [Member] | EPO Senior Notes L [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 800.0 800.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.30%    
Maturity date Sep. 01, 2017    
Senior Debt Obligations [Member] | EPO 364-Day Credit Agreement [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.0 0.0  
Debt Obligations Terms:      
Interest rate terms variable    
Maturity date Sep. 14, 2017    
Maximum borrowing capacity $ 1,500.0    
Maximum bank commitments increase 200.0    
Total maximum borrowing capacity 1,700.0    
Senior Debt Obligations [Member] | EPO Senior Notes V [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 349.7 349.7  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.65%    
Maturity date Apr. 15, 2018    
Senior Debt Obligations [Member] | EPO Senior Notes OO [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750.0 750.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 1.65%    
Maturity date May 07, 2018    
Senior Debt Obligations [Member] | EPO Senior Notes N [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 700.0 700.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.50%    
Maturity date Jan. 31, 2019    
Senior Debt Obligations [Member] | EPO Senior Notes LL [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 800.0 800.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 2.55%    
Maturity date Oct. 15, 2019    
Senior Debt Obligations [Member] | EPO Senior Notes Q [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 500.0 500.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.25%    
Maturity date Jan. 31, 2020    
Senior Debt Obligations [Member] | EPO Senior Notes Y [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,000.0 1,000.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.20%    
Maturity date Sep. 01, 2020    
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.0 0.0  
Debt Obligations Terms:      
Interest rate terms variable    
Maturity date Sep. 15, 2020    
Maximum borrowing capacity $ 4,000.0 3,500.0  
Total maximum borrowing capacity $ 4,500.0    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 1.43%    
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 1.43%    
Senior Debt Obligations [Member] | EPO Multi-Year Revolving Credit Facility [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 1.43%    
Senior Debt Obligations [Member] | EPO Senior Notes RR [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 575.0 0.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 2.85%    
Maturity date Apr. 15, 2021    
Aggregate debt principal issued $ 575.0    
Debt issued as percent of principal amount 99.898%    
Senior Debt Obligations [Member] | EPO Senior Notes CC [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 650.0 650.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.05%    
Maturity date Feb. 15, 2022    
Senior Debt Obligations [Member] | EPO Senior Notes HH [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,250.0 1,250.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.35%    
Maturity date Mar. 15, 2023    
Senior Debt Obligations [Member] | EPO Senior Notes JJ [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 850.0 850.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.90%    
Maturity date Feb. 15, 2024    
Senior Debt Obligations [Member] | EPO Senior Notes MM [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,150.0 1,150.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.75%    
Maturity date Feb. 15, 2025    
Senior Debt Obligations [Member] | EPO Senior Notes PP [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 875.0 875.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.70%    
Maturity date Feb. 15, 2026    
Senior Debt Obligations [Member] | EPO Senior Notes SS [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 575.0 0.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 3.95%    
Maturity date Feb. 15, 2027    
Aggregate debt principal issued $ 575.0    
Debt issued as percent of principal amount 99.76%    
Senior Debt Obligations [Member] | EPO Senior Notes D [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 500.0 500.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.875%    
Maturity date Mar. 01, 2033    
Senior Debt Obligations [Member] | EPO Senior Notes H [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 350.0 350.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.65%    
Maturity date Oct. 15, 2034    
Senior Debt Obligations [Member] | EPO Senior Notes J [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 250.0 250.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.75%    
Maturity date Mar. 01, 2035    
Senior Debt Obligations [Member] | EPO Senior Notes W [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 399.6 399.6  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 7.55%    
Maturity date Apr. 15, 2038    
Senior Debt Obligations [Member] | EPO Senior Notes R [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 600.0 600.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.125%    
Maturity date Oct. 15, 2039    
Senior Debt Obligations [Member] | EPO Senior Notes Z [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 600.0 600.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.45%    
Maturity date Sep. 01, 2040    
Senior Debt Obligations [Member] | EPO Senior Notes BB [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750.0 750.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.95%    
Maturity date Feb. 01, 2041    
Senior Debt Obligations [Member] | EPO Senior Notes DD [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 600.0 600.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.70%    
Maturity date Feb. 15, 2042    
Senior Debt Obligations [Member] | EPO Senior Notes EE [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 750.0 750.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.85%    
Maturity date Aug. 15, 2042    
Senior Debt Obligations [Member] | EPO Senior Notes GG [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,100.0 1,100.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.45%    
Maturity date Feb. 15, 2043    
Senior Debt Obligations [Member] | EPO Senior Notes II [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,400.0 1,400.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.85%    
Maturity date Mar. 15, 2044    
Senior Debt Obligations [Member] | EPO Senior Notes KK [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 1,150.0 1,150.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 5.10%    
Maturity date Feb. 15, 2045    
Senior Debt Obligations [Member] | EPO Senior Notes QQ [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 975.0 875.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.90%    
Maturity date May 15, 2046    
Aggregate debt principal issued $ 100.0    
Debt issued as percent of principal amount 95.516%    
Senior Debt Obligations [Member] | EPO Senior Notes NN [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 400.0 400.0  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 4.95%    
Maturity date Oct. 15, 2054    
Senior Debt Obligations [Member] | TEPPCO Senior Notes 4 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.3 0.3  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 6.65%    
Maturity date Apr. 15, 2018    
Senior Debt Obligations [Member] | TEPPCO Senior Notes 5 [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 0.4 0.4  
Debt Obligations Terms:      
Interest rate terms fixed    
Interest rate, stated percentage 7.55%    
Maturity date Apr. 15, 2038    
Junior Debt Obligations [Member]      
Debt Obligations Terms:      
Gains on early extinguishment of debt   1.6  
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member]      
Debt Instrument [Line Items]      
Principal outstanding [1] $ 521.1 521.1  
Debt Obligations Terms:      
Interest rate terms fixed/variable    
Interest rate, stated percentage [2] 8.375%    
Maturity date Aug. 31, 2066    
Repayment of debt obligations   28.9  
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate [3] 3.708%    
Information regarding variable interest rates paid:      
Weighted-average interest rate paid 4.52%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member] | Minimum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 4.46%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes A [Member] | Maximum [Member]      
Information regarding variable interest rates paid:      
Variable interest rates paid 4.59%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes C [Member]      
Debt Instrument [Line Items]      
Principal outstanding [4] $ 256.4 256.4  
Debt Obligations Terms:      
Interest rate terms fixed/variable    
Interest rate, stated percentage [5] 7.00%    
Maturity date Jun. 01, 2067    
Repayment of debt obligations   29.4  
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate [6] 2.778%    
Junior Debt Obligations [Member] | EPO Junior Subordinated Notes B [Member]      
Debt Instrument [Line Items]      
Principal outstanding [7] $ 682.7 682.7  
Debt Obligations Terms:      
Interest rate terms fixed/variable    
Interest rate, stated percentage [8] 7.034%    
Maturity date Jan. 15, 2068    
Variable annual interest rate thereafter, variable rate basis 3-month LIBOR    
Variable interest rate [9] 2.68%    
Minimum variable annual interest rate [9] 7.034%    
Junior Debt Obligations [Member] | TEPPCO Junior Subordinated Notes [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 14.2 14.2  
Debt Obligations Terms:      
Interest rate terms fixed/variable    
Maturity date Jun. 01, 2067    
Senior Notes [Member]      
Debt Instrument [Line Items]      
Principal outstanding $ 20,650.0    
Debt Obligations Terms:      
Aggregate debt principal issued $ 1,250.0 $ 2,500.0 $ 4,750.0
[1] Fixed rate of 8.375% was paid through August 1, 2016; thereafter, variable rate is reset quarterly and based on 3-month LIBOR plus 3.708%. The total variable rate in effect at December 31, 2016 was approximately 4.59%.
[2] Interest is payable semi-annually in arrears in February and August of each year, which commenced in February 2007.
[3] Interest is payable quarterly in arrears in February, May, August and November of each, which commenced in November 2016.
[4] Fixed rate of 7.000% through September 1, 2017 (i.e., first call date without a make-whole redemption premium); thereafter, a variable rate reset quarterly and based on 3-month LIBOR plus 2.778%.
[5] Interest is payable semi-annually in arrears in June and December of each year, which commenced in December 2009.
[6] Interest is payable quarterly in arrears in March, June, September and December of each year commencing in June 2017.
[7] Fixed rate of 7.034% through January 15, 2018 (i.e., first call date without a make-whole redemption premium); thereafter, the rate will be the greater of 7.034% or a variable rate reset quarterly and based on 3-month LIBOR plus 2.680%.
[8] Interest is payable semi-annually in arrears in January and July of each year, which commenced in January 2008.
[9] Interest is payable quarterly in arrears in January, April, July and October of each year commencing in April 2018.