Restructuring Charges (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
Sep. 30, 2012 Branch	Sep. 30, 2013	Dec. 31, 2012
Restructuring and Related Activities [Abstract]
DistributionBranchesClosed	12
Total restructuring reserve		$ 12	$ 20
Expected payments remainder of current fiscal year		2
Restructuring payments in the next fiscal year		3
Restructuring payments due thereafter		$ 7

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

Name:	us-gaap_RestructuringReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant