Fair Value of Financial Instruments (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	6 Months Ended
Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014 Minimum	Sep. 30, 2014 Maximum
Investments in time and call deposits
Maturity of time deposits			1 month	6 months
Period of ability to redeem invested amounts on call deposits			31 days	95 days
Unrealized gains (losses) on available-for-sale securities	$ 0	$ 0

Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

Name:	us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration