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Long Term Debt	6 Months Ended
Long Term Debt	Jun. 30, 2011
Long-Term Debt [Abstract]
Long-term Debt	7. Long-term Debt In April 2011, the Corporation entered into a new $4 billion syndicated revolving credit facility that matures in April 2016. The new facility, which replaced a $3 billion facility that was scheduled to mature in May 2012, can be used for borrowings and letters of credit. Borrowings on the facility bear interest at 1.25% above the London Interbank Offered Rate. A facility fee of 0.25% per annum is also payable on the amount of the facility. 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 consistent with the previous 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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