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Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Fair Value Disclosures [Abstract]
Capital lease obligations, carrying value	$ 72
Debt excluding short-term borrowings and capital lease obligations, carrying value	$ 16,684

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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