Segment Information (Net Revenue By Revenue Composition ) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 1,061	$ 1,053	$ 2,775	$ 2,499
Publishing and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	738	767	1,835	1,794
Wireless, Internet-Derived Advertising (Digital) [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	274	195	740	532
Distribution [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenue	$ 49	$ 91	$ 200	$ 173