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Balance Sheet Components Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Current Assets [Line Items]
Current deferred income tax asset	$ 41	$ 42
Prepaid expenses	25	38
Assets from price risk management activities	4	13
Margin deposits	5	9
Other	1	1
Other current assets	$ 76	$ 103

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Regulatory assets from price risk management activities

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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