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Redeemable Preferred Units (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Aggregate liquidation preference   $ 300  
Preferrred Units Issued Stated Price   $ 100  
ETE Preferred Units [Member]
     
Quarterly cash distribution, per preferred unit $ 2.0    
Preferred Units Premium Percentage Used For Conversion   10.00%  
Premium Percentage Used For Conversion Of Preferred Units   25.00%  
Discretional Percentage Conversion Rate Based On Issue Price   50.00%  
Preferred units carrying value non-cash adjustment   8 5
Preferred units, fair value 323 331 323
Regency Preferred Units [Member]
     
Quarterly cash distribution, per preferred unit   $ 0.445  
Preferred units outstanding 4,371,586 4,371,586 4,371,586
Common units issued upon conversion   4,658,700  
Subsidiary preferred unit mandatory redemption date   9/2/2029  
Mandatory redeemable price of units outstanding 71 73 71
Regency Mandatorily Redeemable Amount At Expiration [Member]
     
Mandatory redeemable price of units outstanding   $ 80