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Interest Rate Risk Managment (Details)
$ in Millions
1 Months Ended
Dec. 31, 2015
USD ($)
Dec. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Derivative [Line Items]      
Number of Fixed-to-Variable Interest Rate Swap Agreements Entered Into 9    
Interest Rate Swap [Member]      
Derivative [Line Items]      
Derivative, Notional Amount $ 11,000 $ 1,300 $ 9,200
KMP 3.50% Senior Notes due September 1, 2023 [Member]      
Derivative [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.50%    
4.15% Senior Notes due February 1, 2024 [Member] [Member]      
Derivative [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.15%    
EPB 4.30% Senior Notes due May 1, 2024 [Member]      
Derivative [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.30%    
Fair Value Hedging [Member] | Interest Rate Swap [Member]      
Derivative [Line Items]      
Derivative, Notional Amount $ 9,700