Membership Interests (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Jan. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Distribution Restrictions [Line Items]
Cash Dividends Paid to Parent Company	$ 680		$ 680
Interest Received on Holdings of long-term debt of affiliates		0	(208)
Mark-to-market gain reclassified from AOCI			284
Effect of Reduction of Push Down Debt			420
Senior Notes [Member] | Related Party Transactions, Returned Debt as Dividend [Member]
Distribution Restrictions [Line Items]
Debt Instrument, Principal Amounts Cancelled			6,360
Long-Term Debt of Affiliate Held by EFIH [Member]
Distribution Restrictions [Line Items]
Cash Dividends Paid to Parent Company			0
Interest Received on Holdings of long-term debt of affiliates			$ (208)