Accrued Expenses and Other Long-Term Liabilities (Tables)

12 Months Ended

Dec. 31, 2012

Accrued expenses and other long-term liabilities consisted of the following as of December 31 (in millions):



	Accrued Expenses				Other Long-Term Liabilities
	2012		2011		2012		2011
Defined benefit plan liabilities (see Note 14)	$	32	$	37	$	982	$	795
Wage and other employee-related liabilities	282		259		91		79
Uncertain income tax position liabilities (see Note 16)	—		—		391		337
Environmental liabilities	27		39		242		235
Accrued interest expense	96		108		—		—
Derivative liabilities	14		25		—		—
Asset retirement obligations	5		6		103		81
Other accrued liabilities	134		121		321		354
Accrued expenses and other long-term liabilities	$	590	$	595	$	2,130	$	1,881

Changes in our environmental liabilities were as follows (in millions):



	Year Ended December 31,
	2012			2011			2010
Balance as of beginning of year	$	274		$	268		$	279
Pembroke Acquisition	—			30			—
Additions to liability	23			18			50
Reductions to liability	(1		)	(5		)	(21		)
Payments, net of third-party recoveries	(29		)	(35		)	(42		)
Foreign currency translation	2			(2		)	2
Balance as of end of year	$	269		$	274		$	268

Changes in our asset retirement obligations were as follows (in millions).



	Year Ended December 31,
	2012			2011			2010
Balance as of beginning of year	$	87		$	101		$	179
Additions to accrual	28			4			3
Reductions to accrual	(1		)	—			(34		)
Accretion expense	5			4			7
Settlements	(11		)	(22		)	(54		)
Balance as of end of year	$	108		$	87		$	101