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Supplemental Financial Information - Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Other Current Assets [Abstract]
Current deferred tax assets	$ 265us-gaap_DeferredTaxAssetsNetCurrent	$ 264us-gaap_DeferredTaxAssetsNetCurrent
Other	284us-gaap_OtherAssetsMiscellaneousCurrent	240us-gaap_OtherAssetsMiscellaneousCurrent
Total other current assets	$ 549us-gaap_OtherAssetsCurrent	$ 504us-gaap_OtherAssetsCurrent

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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