Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Litigation Charge	$ 16	$ 0
Gain on Business Combination	81	0
Distribution Solutions [Member]
Segment Reporting Information [Line Items]
Percentage of revenue derived from services for Distributions Solutions segment	less than 2%	less than 2%
Corporate [Member]
Segment Reporting Information [Line Items]
Gain on Business Combination	81
Average Wholesale Price Litigation [Member]
Segment Reporting Information [Line Items]
Litigation Charge	16	0
Average Wholesale Price Litigation [Member] \| Distribution Solutions [Member]
Segment Reporting Information [Line Items]
Litigation Charge	$ 16

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_LossContingencyLossInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration