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Fair Value Measurements 2 (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011
Carrying Value [Member]
Liabilities:
Total debt	$ 1,309	$ 1,551
Fair value of facilities abandonment reserve	42	52
Estimated Fair Value [Member]
Liabilities:
Total debt	1,412	1,619
Fair value of facilities abandonment reserve	$ 49	$ 59

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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