Goodwill and Acquired Intangibles Goodwill and Acquired Intangibles (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill and Acquired Intangibles [Abstract]

The changes in the carrying amount of goodwill during 2011 and 2010 were as follows (in millions):



	2011		2010
Balance as of beginning of year	$	36	$	46
Goodwill write-off	—		(10		)
Balance as of end of year	$	36	$	36

Acquired Intangibles [Table Text Block]

The following table provides the historical cost and accumulated amortization for each major class of acquired intangible assets, excluding goodwill (in millions):



	December 31, 2011						December 31, 2010
	Historical Cost		Accumulated Amortization		Net Book Value		Historical Cost		Accumulated Amortization		Net Book Value
Air emissions credits	$	229	$	64	$	165	$	229	$	51	$	178
USA Gasoline tradename	35		8		27		35		6		29
Customer agreements and contracts	34		21		13		34		18		16
Refinery permits and plans	17		7		10		17		6		11
Favorable leases	11		3		8		12		3		9
Other intangibles	26		23		3		27		24		3
Total	$	352	$	126	$	226	$	354	$	108	$	246

- Definition

Tabular disclosure of amortizable intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

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