Balance Sheet Components Schedule of Other Asssets and Other Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other current assets:
Current deferred income tax asset	$ 42	$ 51
Prepaid Expense, Current	38	37
Assets from price risk management activities	13	4
Other	1	1
Other Assets, Current	94	93
Accrued expenses and other current liabilities:
Accrued employee compensation and benefits	46	46
Accrued interest payable	23	23
Dividends payable	22	21
Taxes Payable, Current	21	21
Regulatory Liability, Current	1	12
Other	58	56
Other Liabilities, Current	$ 171	$ 179