Recently issued accounting pronouncements (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
Jan. 02, 2014
Recently Issued Accounting Standards
Reclassification between deferred income taxes, net under non-current liabilities and other liabilities under non-current liabilities related to the presentation of an unrecognized tax benefit in the financial statements	$ 46

Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 25

-Section 65

-Paragraph 1

-Subparagraph (c)(4)

-URI http://asc.fasb.org/extlink&oid=19771798&loc=SL6749767-165964

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