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Financial Instruments	3 Months Ended
Mar. 31, 2014
Financial Instruments [Abstract]
Financial Instruments	6. Financial Instruments The fair value of financial instruments is determined by reference to observable market data and other valuation techniques as appropriate. The only category of financial instruments where the difference between fair value and recorded book value is notable is long-term debt. The estimated fair value of total long-term debt, excluding capitalized lease obligations, was $12,086 million at March 31, 2014, and $6,787 million at December 31, 2013, as compared to recorded book values of $11,786 million at March 31, 2014, and $6,516 million at December 31, 2013. The increase in the estimated fair value and book value of long-term debt reflects the Corporation's issuance of $5,500 million of long-term debt in the first quarter of 2014. The $5,500 million of long-term debt is comprised of $750 million of floating-rate notes due in 2017, $500 million of floating-rate notes due in 2019, $1,500 million of 0.921% notes due in 2017, $1,750 million of 1.819% notes due in 2019, and $1,000 million of 3.176% notes due in 2024. The fair value of long-term debt by hierarchy level at March 31, 2014, is: Level 1 $11,142 million; Level 2 $880 million; and Level 3 $64 million. Level 1 represents quoted prices in active markets. Level 2 includes debt whose fair value is based upon a publicly available index. Level 3 involves using internal data augmented by relevant market indicators if available.

Financial Instruments

3 Months Ended

Mar. 31, 2014

6. Financial Instruments

The fair value of financial instruments is determined by reference to observable market data and other valuation techniques as appropriate. The only category of financial instruments where the difference between fair value and recorded book value is notable is long-term debt. The estimated fair value of total long-term debt, excluding capitalized lease obligations, was $12,086 million at March 31, 2014, and $6,787 million at December 31, 2013, as compared to recorded book values of $11,786 million at March 31, 2014, and $6,516 million at December 31, 2013. The increase in the estimated fair value and book value of long-term debt reflects the Corporation's issuance of $5,500 million of long-term debt in the first quarter of 2014. The $5,500 million of long-term debt is comprised of $750 million of floating-rate notes due in 2017, $500 million of floating-rate notes due in 2019, $1,500 million of 0.921% notes due in 2017, $1,750 million of 1.819% notes due in 2019, and $1,000 million of 3.176% notes due in 2024.

The fair value of long-term debt by hierarchy level at March 31, 2014, is: Level 1 $11,142 million; Level 2 $880 million; and Level 3 $64 million. Level 1 represents quoted prices in active markets. Level 2 includes debt whose fair value is based upon a publicly available index. Level 3 involves using internal data augmented by relevant market indicators if available.