Debt and Capital Lease Obligations (Tables)

12 Months Ended

Dec. 31, 2012

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,
		2012			2011
Bank credit facilities	Various	$	—		$	—
Industrial revenue bonds:
Tax-exempt Revenue Refunding Bonds:
Series 1997A, 5.45%	2027	—			18
Tax-exempt Waste Disposal Revenue Bonds:
Series 1997, 5.6%	2031	—			25
Series 1998, 5.6%	2032	—			25
Series 1999, 5.7%	2032	—			25
Series 2001, 6.65%	2032	—			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
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:
6.7%	2013	180			180
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, 4.0%	2040	300			—
Accounts receivable sales facility	2013	100			250
Net unamortized discount, including fair value adjustments		(29		)	(51		)
Total debt		7,000			7,690
Capital lease obligations, including unamortized fair value adjustments		49			51
Total debt and capital lease obligations		7,049			7,741
Less current portion		(586		)	(1,009		)
Debt and capital lease obligations, less current portion		$	6,463		$	6,732

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, 2012		December 31, 2011
Letter of credit facilities	$	550	June 2013	$	418	$	300
Revolver	$	3,000	December 2016	$	59	$	119
Canadian revolving credit facility	C$	50	November 2013	C$	10	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,
	2012			2011		2010
Balance as of beginning of year	$	250		$	100	$	200
Proceeds from the sale of receivables	1,500			150		1,225
Repayments	(1,650		)	—		(1,325		)
Balance as of end of year	$	100		$	250	$	100

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, 2012 were as follows (in millions):

	Debt			Capital Lease Obligations
2013	$	580		$	12
2014	200			10
2015	475			9
2016	—			8
2017	950			7
Thereafter	4,824			35
Net unamortized discount and fair value adjustments	(29		)	—
Less interest expense	—			(32		)
Total	$	7,000		$	49