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Supplemental Financial Information - Other Current Assets (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Other Current Assets [Abstract]
Current deferred tax assets	$ 295	$ 262
Other	262	306
Total other current assets	$ 557	$ 568

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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