Balance Sheet Components Other Current Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued employee compensation and benefits	$ 38	$ 46
Accrued interest payable	36	23
Accrued taxes payable	28	21
Accrued dividends payable	22	22
Regulatory liabilities—current	2	1
Other	56	58
Total accrued expenses and other current liabilities	$ 182	$ 171