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Stock-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stock-Based Compensation Arrangement by Stock-based Payment Award    
Stock-based compensation expense (benefit) $ 28us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ (18)us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Income tax benefit (expense) for stock-based compensation arrangements 11us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (7)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Tax benefit realized from exercise of stock-based compensation arrangements 54us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions 3us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Stock appreciation rights    
Stock-Based Compensation Arrangement by Stock-based Payment Award    
Stock-based compensation expense (benefit) 15us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1] (18)us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]
Performance share awards    
Stock-Based Compensation Arrangement by Stock-based Payment Award    
Stock-based compensation expense (benefit) 4us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2] (3)us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2]
Market stock units    
Stock-Based Compensation Arrangement by Stock-based Payment Award    
Stock-based compensation expense (benefit) 5us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= tso_MarketStockUnitsMember		 [3] 3us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= tso_MarketStockUnitsMember		 [3]
Other stock-based awards    
Stock-Based Compensation Arrangement by Stock-based Payment Award    
Stock-based compensation expense (benefit) $ 4us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= tso_OtherStockBasedAwardsMember		 [4] $ 0us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= tso_OtherStockBasedAwardsMember		 [4]
[1] We paid cash of $20 million and $4 million to settle 0.3 million and 0.2 million SARs that were exercised during the three months ended March 31, 2015 and 2014, respectively. We had $55 million and $60 million recorded in accrued liabilities associated with our SARs awards at March 31, 2015 and December 31, 2014, respectively.
[2] We granted 0.1 million market condition performance share awards at a weighted average grant date fair value of $117.96 per share under the amended and restated 2011 Long-Term Incentive Plan (“2011 Plan”) during the three months ended March 31, 2015.
[3] We granted 0.4 million market stock units at a weighted average grant date fair value of $114.57 per unit under the 2011 Plan during the three months ended March 31, 2015.
[4] We have aggregated expenses for certain award types as they are not considered significant.