Debt and Capital Lease Obligations (Tables)

12 Months Ended

Dec. 31, 2013

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,
		2013			2012
Bank credit facilities	Various	$	—		$	—
Senior Notes:
4.5%	2015	400			400
4.75%	2013	—			300
4.75%	2014	200			200
6.125%	2017	750			750
6.125%	2020	850			850
6.625%	2037	1,500			1,500
6.7%	2013	—			180
6.75%	2037	24			24
7.2%	2017	200			200
7.45%	2097	100			100
7.5%	2032	750			750
8.75%	2030	200			200
9.375%	2019	750			750
10.5%	2039	250			250
Debentures:
7.65%	2026	100			100
8.75%	2015	75			75
Gulf Opportunity Zone Revenue Bonds, Series 2010, 4.0%	2040	300			300
Accounts receivable sales facility	2014	100			100
Net unamortized discount, including fair value adjustments		(24		)	(29		)
Total debt		6,525			7,000
Capital lease obligations, including unamortized fair value adjustments		39			49
Total debt and capital lease obligations		6,564			7,049
Less current portion		(303		)	(586		)
Debt and capital lease obligations, less current portion		$	6,261		$	6,463

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, 2013		December 31, 2012
Letter of credit facilities	$	550	June 2014	$	278	$	418
Revolver	$	3,000	November 2018	$	59	$	59
Canadian revolving credit facility	C$	50	November 2014	C$	10	C$	10

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,
	2013		2012			2011
Balance as of beginning of year	$	100	$	250		$	100
Proceeds from the sale of receivables	—		1,500			150
Repayments	—		(1,650		)	—
Balance as of end of year	$	100	$	100		$	250

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, 2013 were as follows (in millions):

	Debt			Capital Lease Obligations
2014	$	300		$	8
2015	475			8
2016	—			7
2017	950			7
2018	—			6
Thereafter	4,824			27
Net unamortized discount and fair value adjustments	(24		)	1
Less interest expense	—			(25		)
Total	$	6,525		$	39