Interest Expense and Related Charges - Contractual Interest Expense on Pre-Petition Liabilities Classified As Liabilities Subject to Compromise (Details) - USD ($)
$ in Millions

2 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2015

Contractual Interest Expense On Pre-Petition Liabilities [Line Items]

Post-Petition Interest Related to Prior Periods Paid And Accrued On Pre-Petition Debt

$ 185

Energy Future Intermediate Holding CO LLC [Member]

Contractual Interest Expense On Pre-Petition Liabilities [Line Items]

Contractual Interest Expense On Pre-Petition Liabilities Classified As Liabilities Subject To Compromise

$ 133

$ 101

213

Interest Expense On Prepetition Liabilities Recognized In Statement Of Operations, Paid or Accrued Amounts Allowed On Notes Exchanged-Settled

^[1]

Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations

$ 79

$ 101

$ 163

Secured Debt [Member] | Fixed Senior Secured Second Lien 11% Notes and Fixed Senior Secured Second Lien 11.75% Notes [Member] [Member]

Contractual Interest Expense On Pre-Petition Liabilities [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

11.00%

Secured Debt [Member] | Senior Secured Second Lien 11.75% Notes due March 1, 2022 [Member]

Contractual Interest Expense On Pre-Petition Liabilities [Line Items]

Debt Instrument, Interest Rate, Stated Percentage

11.75%

[1]

(a)Six months ended June 30, 2015 represents portion of interest related to the EFIH Second Lien Notes that was repaid based on the approval of the Bankruptcy Court; however, excludes $185 million of post-petition interest paid in 2015 that contractually related to 2014 and default interest (see Note 9). Post-petition period ended June 30, 2014 represents interest on EFIH First Lien Notes exchanged and settled in June 2014 (see Note 8).

Energy Future Intermediate Holding CO LLC 10-Q