Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets [Abstract]
Restricted cash	$ 36	$ 100
Accounts receivable	724	723
Securitized regulatory assets	182	231
Other assets	142	141
Total Assets	17,226	17,410
Liabilities [Abstract]
Current portion long-term debt	675	504
Current regulatory liabilities	171	278
Securitization bonds	0	105
Other long term liabilities	102	101
Variable Interest Entity Securitization [Member]
Assets [Abstract]
Restricted cash	36	100
Accounts receivable	40	34
Securitized regulatory assets	182	231
Other assets	3	4
Total Assets	261	369
Liabilities [Abstract]
Accounts payable and accrued current liabilities	1	7
Current portion long-term debt	202	196
Current regulatory liabilities	41	43
Securitization bonds	0	105
Other long term liabilities	8	8
Total Liabilities	$ 252	$ 359