Debt and Interest Expense (Tables)

3 Months Ended

Mar. 31, 2013

Table Text Block [Abstract]

Debt Outstanding and Debt Activity Tables

	March 31,		December 31,
millions	2013		2012
Total debt at face value	$	15,337	$	14,952
Net unamortized discounts and premiums (1)		(1,674)		(1,683)
Total long-term debt	$	13,663	$	13,269

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(1)Unamortized discounts and premiums are amortized over the term of the related debt.

		Carrying
millions		Value		Description
Balance at December 31, 2012		$	13,269
	Borrowings		385	WES revolving credit facility
	Other, net		9	Amortization of debt discounts and premiums
Balance at March 31, 2013		$	13,663

Interest Expense Table

	Three Months Ended
	March 31,
millions	2013		2012
Current debt, long-term debt, and other	$	232	$	250
Capitalized interest		(68)		(64)
Interest expense	$	164	$	186