Debt and Capital Lease Obligations (Tables)

12 Months Ended

Dec. 31, 2011

Debt and Capital Lease Obligations [Abstract]

Debt and capital lease obligations

Debt, at stated values, and capital lease obligations consisted of the following (in millions):

	Final Maturity	December 31,
		2011			2010
Bank credit facilities	Various	$	—		$	—
Industrial revenue bonds:
Tax-exempt Revenue Refunding Bonds:
Series 1997A, 5.45%	2027	18			21
Series 1997B, 5.4%	2018	—			30
Series 1997C, 5.4%	2018	—			30
Tax-exempt Waste Disposal Revenue Bonds:
Series 1997, 5.6%	2031	25			25
Series 1998, 5.6%	2032	25			25
Series 1999, 5.7%	2032	25			25
Series 2001, 6.65%	2032	19			19
4.5% notes	2015	400			400
4.75% notes	2013	300			300
4.75% notes	2014	200			200
6.125% notes	2017	750			750
6.125% notes	2020	850			850
6.625% notes	2037	1,500			1,500
6.875% notes	2012	750			750
7.5% notes	2032	750			750
8.75% notes	2030	200			200
Debentures:
7.65%	2026	100			100
8.75%	2015	75			75
Senior Notes:
6.125%	2011	—			200
6.7%	2013	180			180
6.75%	2011	—			210
6.75%	2037	24			24
7.2%	2017	200			200
7.45%	2097	100			100
9.375%	2019	750			750
10.5%	2039	250			250
Gulf Opportunity Zone Revenue Bonds, Series 2010, variable rate	2040	—			300
Accounts receivable sales facility	2012	250			100
Net unamortized discount, including fair value adjustments		(51		)	(64		)
Total debt		7,690			8,300
Capital lease obligations, including unamortized fair value adjustments		51			37
Total debt and capital lease obligations		7,741			8,337
Less current portion		(1,009		)	(822		)
Debt and capital lease obligations, less current portion		$	6,732		$	7,515

Outstanding letters of credit under committed lines of credit

We had outstanding letters of credit under our committed lines of credit as follows (in millions):

				Amounts Outstanding
	Borrowing Capacity		Expiration	December 31, 2011		December 31, 2010
Letter of credit facilities	$	500	June 2012	$	300	$	100
Revolver	$	3,000	December 2016	$	119	$	399
Canadian revolving credit facility	C$	115	December 2012	C$	20	C$	20

Changes in accounts receivable sales facility

Changes in the amounts outstanding under our accounts receivable sales facility were as follows (in millions):

	Year Ended December 31,
	2011		2010			2009
Balance as of beginning of year	$	100	$	200		$	100
Proceeds from the sale of receivables	150		1,225			950
Repayments	—		(1,325		)	(850		)
Balance as of end of year	$	250	$	100		$	200

Principal payments on debt and future minimum rentals on capital lease obligations

Principal payments on our debt obligations and future minimum rentals on capital lease obligations as of December 31, 2011 were as follows (in millions):

	Debt			Capital Lease Obligations
2012	$	1,004		$	11
2013	484			10
2014	200			9
2015	475			8
2016	—			8
Thereafter	5,578			37
Net unamortized discount and fair value adjustments	(51		)	—
Less interest expense	—			(32		)
Total	$	7,690		$	51