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Financing Arrangements and Derivative Financial Instruments Credit Arrangements - Narrative (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Debt Instrument [Line Items]  
Credit Arrangements $ 8,432gt_CreditArrangements
Credit Arrangements, Unused Amount 1,888us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Debt, Percentage Bearing Variable Interest, Percentage Rate 34.00%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Variable rate credit arrangements [Member]  
Debt Instrument [Line Items]  
Weighted average interest rate 5.62%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_VariableRateAxis
= gt_VariableratecreditarrangementsMember
Short-term Debt  
Debt Instrument [Line Items]  
Credit Arrangements 417gt_CreditArrangements
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember
Credit Arrangements, Unused Amount 394us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember
Long-term Debt  
Debt Instrument [Line Items]  
Credit Arrangements 8,015gt_CreditArrangements
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
Credit Arrangements, Unused Amount $ 1,494us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember