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Finanancial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Financial Instruments, Owned, at Fair Value [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table presents carrying amounts and estimated fair values of our current and long-term debt:



	Estimated Fair Value Using Input Type
	Carrying Amount		Quoted prices in active markets		Observable		Unobservable		Total estimated fair value
	(in millions)
December 31, 2012	$	23,570	$	17,506	$	6,118	$	3,104	$	26,728
December 31, 2011	$	19,505	$	12,567	$	5,023	$	—	$	17,590

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

+ References

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+ Details