v2.4.0.6
Pension and Other Postretirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Pension Plans, Defined Benefit [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost $ 6 $ 3
Defined Benefit Plan, Interest Cost 23 4
Defined Benefit Plan, Expected Return on Plan Assets (44) (6)
Defined Benefit Plan, Amortization of Net Gains (Losses) 0 2
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments (3) 0
Defined Benefit Plan, Net Periodic Benefit Cost (18) 3
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost 0 0
Defined Benefit Plan, Interest Cost 5 1
Defined Benefit Plan, Expected Return on Plan Assets (2) (1)
Defined Benefit Plan, Amortization of Net Gains (Losses) 1 1
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments 0 0
Defined Benefit Plan, Net Periodic Benefit Cost 4 1
Kinder Morgan Energy Partners, L.P. [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Net Periodic Benefit Cost 1 3
El Paso Pipeline Partners, L.P. [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Net Periodic Benefit Cost   $ 1