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Debt	3 Months Ended
Debt	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt	5. Debt In January 2015, the Corporation entered into a new $4 billion syndicated revolving credit facility that expires in January 2020. The new facility, which replaced a $4 billion facility that was scheduled to expire in April 2016, can be used for borrowings and letters of credit. Based on the Corporation’s credit rating as of March 31, 2015, borrowings on the facility will generally bear interest at 1.075% above the London Interbank Offered Rate with the facility fee amounting to 0.175% per annum. The interest rate and facility fee are subject to adjustment if the Corporation's credit rating changes. The restrictions on the amount of total borrowings and secured debt are substantially similar to the previous facility. At March 31, 2015, there were no borrowings outstanding or letters of credit issued against the syndicated revolving credit facility.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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