Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets [Abstract]
Restricted cash	$ 100	$ 102
Accounts receivable	723	697
Securitized regulatory assets	231	413
Other assets	141	138
Total Assets	17,410	17,651
Liabilities [Abstract]
Current regulatory liabilities	177	139
Current portion long-term debt, including capital leases	504	443
Securitization bonds	105	302
Other long term liabilities	101	103
Variable Interest Entity Securitization [Member]
Assets [Abstract]
Restricted cash	100	102
Accounts receivable	34	34
Securitized regulatory assets	231	413
Other assets	4	7
Total Assets	369	556
Liabilities [Abstract]
Accounts payable and accrued current liabilities	7	11
Current regulatory liabilities	43	50
Current portion long-term debt, including capital leases	196	177
Securitization bonds	105	302
Other long term liabilities	8	7
Total Liabilities	$ 359	$ 547