Balance Sheet Components Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Other Current Assets [Line Items]
Current deferred income tax asset	$ 43	$ 42
Prepaid expenses	32	38
Assets from price risk management activities	18	13
Margin Deposit Assets	2	9
Other	3	1
Other current assets	$ 98	$ 103