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Stock Compensation Plans Stock Options (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award      
Options Outstanding 10,350,633us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 12,787,545us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Options Outstanding Weighted Average Exercise Price $ 16.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 15.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Options granted 816,713us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod    
Options granted Weighted Average Exercise Price $ 26.22us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice    
Options exercised (2,941,178)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised    
Options exercised Weighted Average Exercise Price $ 13.82us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice    
Options expired (107,909)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod    
Options expired Weighted Average Exercise Price $ 12.54us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice    
Options cancelled (204,538)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod    
Options cancelled Weighted Average Exercise Price $ 17.77us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice    
Vested and expected to vest 9,954,431us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber    
Vested and expected to vest Weighted Average Exercise Price $ 16.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice    
Exercisable 6,748,799us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Exercisable Weighted Average Exercise Price $ 16.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice    
Available for grant 9,954,317us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant    
Weighted Average Remaining Contractual Term (Years) 5 years 8 months 4 days    
Vested and expected to vest Weighted Average Remaining Contractual Term (Years) 5 years 7 months 2 days    
Exercisable Weighted Average Remaining Contractual Term (Years) 4 years 4 months 8 days    
Options exercised Aggregate Intrinsic Value (in millions) $ 37us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Outstanding Aggregate Intrinsic Value (In millions) 123us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Vested and expected to vest Intrinsic Value (in millions) 119us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue    
Exercisable Aggregate Intrinsic Value $ 79us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1    
Weighted average fair value per share for the stock options $ 11.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 6.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 6.33us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Black-Scholes model assumptions:      
Expected term (years) 7 years 4 months 23 days [1] 6 years 3 months [1] 6 years 3 months [1]
Interest rate 2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate [1] 1.11%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate [1] 1.09%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate [1]
Volatility 43.45%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [1] 46.66%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [1] 50.83%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate [1]
Dividend yield 0.81%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate [1] 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate [1] 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate [1]
Grant Date February 24 2014 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share Based Compensation Options Exercise Price $ 26.44gt_ShareBasedCompensationOptionsExercisePrice
/ gt_GrantDateAxis
= gt_GrantDateFebruary242014Member		    
Options Outstanding 600,801us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary242014Member		    
Exercisable 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary242014Member		    
Weighted Average Remaining Contractual Term (Years) 9 years 1 month 30 days    
Grant Date February 28 2013 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share Based Compensation Options Exercise Price $ 12.98gt_ShareBasedCompensationOptionsExercisePrice
/ gt_GrantDateAxis
= gt_GrantDateFebruary282013Member		    
Options Outstanding 1,815,818us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary282013Member		    
Exercisable 422,219us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary282013Member		    
Weighted Average Remaining Contractual Term (Years) 8 years 1 month 30 days    
Grant Date February 27 2012 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share Based Compensation Options Exercise Price $ 12.94gt_ShareBasedCompensationOptionsExercisePrice
/ gt_GrantDateAxis
= gt_GrantDateFebruary272012Member		    
Options Outstanding 1,433,627us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary272012Member		    
Exercisable 666,348us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary272012Member		    
Weighted Average Remaining Contractual Term (Years) 7 years 2 months 30 days    
Grant Date February 22 2011 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share Based Compensation Options Exercise Price $ 13.91gt_ShareBasedCompensationOptionsExercisePrice
/ gt_GrantDateAxis
= gt_GrantDateFebruary222011Member		    
Options Outstanding 995,776us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary222011Member		    
Exercisable 712,524us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary222011Member		    
Weighted Average Remaining Contractual Term (Years) 6 years 1 month 30 days    
Grant Date February 23 2010 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share Based Compensation Options Exercise Price $ 12.74gt_ShareBasedCompensationOptionsExercisePrice
/ gt_GrantDateAxis
= gt_GrantDateFebruary232010Member		    
Options Outstanding 771,769us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary232010Member		    
Exercisable 771,769us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary232010Member		    
Weighted Average Remaining Contractual Term (Years) 5 years 1 month 30 days    
Grant Date February 26 2009 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share Based Compensation Options Exercise Price $ 4.81gt_ShareBasedCompensationOptionsExercisePrice
/ gt_GrantDateAxis
= gt_GrantDateFebruary262009Member		    
Options Outstanding 707,972us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary262009Member		    
Exercisable 707,972us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary262009Member		    
Weighted Average Remaining Contractual Term (Years) 4 years 1 month 30 days    
Grant Date February 21 2008 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share Based Compensation Options Exercise Price $ 26.74gt_ShareBasedCompensationOptionsExercisePrice
/ gt_GrantDateAxis
= gt_GrantDateFebruary212008Member		    
Options Outstanding 976,043us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary212008Member		    
Exercisable 976,043us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary212008Member		    
Weighted Average Remaining Contractual Term (Years) 3 years 1 month 30 days    
Grant Date February 27 2007 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share Based Compensation Options Exercise Price $ 24.71gt_ShareBasedCompensationOptionsExercisePrice
/ gt_GrantDateAxis
= gt_GrantDateFebruary272007Member		    
Options Outstanding 1,039,847us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary272007Member		    
Exercisable 1,039,847us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_GrantDateFebruary272007Member		    
Weighted Average Remaining Contractual Term (Years) 2 years 2 months 30 days    
Grant Date December 6 2005 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Share Based Compensation Options Exercise Price $ 17.15gt_ShareBasedCompensationOptionsExercisePrice
/ gt_GrantDateAxis
= gt_GrantDateDecember62005Member		    
Options Outstanding 405,944us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_GrantDateDecember62005Member		    
Exercisable 405,944us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_GrantDateDecember62005Member		    
Weighted Average Remaining Contractual Term (Years) 11 months    
All Other Grant Dates [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Options Outstanding 1,603,036us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ gt_GrantDateAxis
= gt_AllOtherGrantDatesMember		 [2]    
Options Outstanding Weighted Average Exercise Price $ 18.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ gt_GrantDateAxis
= gt_AllOtherGrantDatesMember		    
Exercisable 1,046,133us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ gt_GrantDateAxis
= gt_AllOtherGrantDatesMember		 [2]    
Exercisable Weighted Average Exercise Price $ 17.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ gt_GrantDateAxis
= gt_AllOtherGrantDatesMember		    
Weighted Average Remaining Contractual Term (Years) 6 years    
Exercisable Weighted Average Remaining Contractual Term (Years) 4 years 7 months 2 days    
[1] We review the assumptions used in our Black-Scholes model in conjunction with estimating the grant date fair value of the annual grants of stock-based awards by our Board of Directors.
[2] Options in the “All other” category had exercise prices ranging from $6.22 to $36.25. The weighted average exercise price for options outstanding and exercisable in that category was $18.43 and $17.56, respectively, while the remaining weighted average contractual term was 6.0 and 4.6, respectively.