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Common Stock (Details)
In Millions, unless otherwise specified
Dec. 31, 2014
Equity [Abstract]  
Common stock reserved for issuance pursuant to Employee stock benefit plans (in shares) 47us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Common stock reserved for issuance and not granted pursuant to Employee stock benefit plans (in shares) 20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant