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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2011
Earnings Loss Per Share [Abstract]  
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block]
Share and per share calculations are presented below (in millions except per share amounts):
 
2011
 
2010
 
2009
Basic:
 
 
 
 
 
Net earnings (loss) attributable to Tesoro Corporation stockholders
$
546

 
$
(29
)
 
$
(140
)
Weighted average common shares outstanding
141.4

 
140.6

 
138.2

Basic Earnings (Loss) Per Share
$
3.86

 
$
(0.21
)
 
$
(1.01
)
Diluted:
 
 
 
 
 
Net earnings (loss) attributable to Tesoro Corporation stockholders
$
546

 
$
(29
)
 
$
(140
)
Weighted average common shares outstanding
141.4

 
140.6

 
138.2

Common stock equivalents
1.9

 
—

 
—

Total diluted shares
143.3

 
140.6

 
138.2

Diluted Earnings (Loss) Per Share
$
3.81

 
$
(0.21
)
 
$
(1.01
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Potentially dilutive common stock equivalents that were excluded from the calculation of diluted earnings (loss) per share, as the effect of including such securities would have been anti-dilutive, were as follows (in millions):
 
2011
 
2010
 
2009
Common stock equivalents (a)
—

 
1.4

 
1.5

Stock options (b)
3.1

 
5.6

 
4.8

________________
(a)
For the years ended December 31, 2010 and 2009, common stock equivalents, including stock options, were excluded as a result of the net loss reported during the period.
(b)
Common stock options presented above were excluded as the exercise prices were greater than the average market price of the common stock during each respective reporting period.