Debt And Financing Activities (Tables)

12 Months Ended

Mar. 31, 2012

Debt And Financing Activities [Abstract]

Schedule Of Long-Term Debt

	March 31,
(In millions)		2012			2011
7.75% Notes due February 1, 2012	$	0		$	399
5.25% Notes due March 1, 2013		500			499
6.50% Notes due February 15, 2014		350			350
3.25% Notes due March 1, 2016		598			598
5.70% Notes due March 1, 2017		499			499
7.50% Notes due February 15, 2019		349			349
4.75% Notes dues March 1, 2021		598			598
7.65% Debentures due March 1, 2027		175			175
6.00% Notes due March 1, 2041		493			493
Other		18			44
Total debt		3,580			4,004
Less current portion		(508	)		(417	)
Total long-term debt	$	3,072		$	3,587