Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Commitments And Contingencies [Abstract]

Minimum Annual Lease Payments [Table Text Block]

Our minimum annual lease payments, as of December 31, 2011, for operating leases having initial or remaining noncancellable lease terms in excess of one year were (in millions):

	Ship Charters (a)		Other		Total
2012	$	100	$	113	$	213
2013	50		112		162
2014	18		107		125
2015	11		101		112
2016	10		93		103
Thereafter	—		442		442
Total minimum rental payments	$	189	$	968	$	1,157

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(a) Includes minimum annual lease payments for tugs and barges, which range between $10 million and $33 million over the next five years

Changes in Environmental Liabilities [Table Text Block]

Changes in our environmental liabilities for the years ended December 31, 2011 and 2010, were as follows (in millions):

	Years Ended December 31,
	2011			2010
Balance at beginning of year	$	108		$	106
Additions, net	11			37
Expenditures	(26		)	(35		)
Balance at end of year	$	93		$	108