Debt and Financing Activities (Tables)

12 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

	March 31,
(In millions)	2013			2012
5.25% Notes due March 1, 2013	$	—		$	500
6.50% Notes due February 15, 2014	350			350
0.95% Notes due December 4, 2015	499			—
3.25% Notes due March 1, 2016	599			598
5.70% Notes due March 1, 2017	500			499
1.40% Notes due March 15, 2018	499			—
7.50% Notes due February 15, 2019	349			349
4.75% Notes due March 1, 2021	598			598
2.70% Notes due December 15, 2022	400			—
2.85% Notes due March 15, 2023	400			—
7.65% Debentures due March 1, 2027	175			175
6.00% Notes due March 1, 2041	493			493
Other	11			18
Total debt	4,873			3,580
Less current portion	(352		)	(508		)
Total long-term debt	$	4,521		$	3,072