Segment Information (Net Revenue By Revenue Composition ) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 711	$ 715	$ 1,666	$ 1,714
Publishing and other
Segment Reporting, Revenue Reconciling Item
Net revenue	365	450	957	1,097
Wireless, Internet-Derived Advertising (Digital)
Segment Reporting, Revenue Reconciling Item
Net revenue	324	234	666	466
Distribution
Segment Reporting, Revenue Reconciling Item
Net revenue	$ 22	$ 31	$ 43	$ 151

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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