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Financial Instruments, Derivatives and Hedging Activities (Details 5) (USD $) In Billions, unless otherwise specified	Mar. 31, 2015
Financial Instruments, Derivatives and Hedging Activities
Carrying amount	$ 2.21us-gaap_LongTermDebt
Long-term debt	$ 2.35us-gaap_LongTermDebtFairValue

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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