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Financing Arrangements and Derivative Financial Instruments Credit Arrangements Narrative (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Debt Instrument [Line Items]  
Credit Arrangements $ 9,029gt_CreditArrangements
Debt Instrument, Unused Borrowing Capacity, Amount 2,317us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 35.00%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Variable rate credit arrangements  
Debt Instrument [Line Items]  
Weighted Average Interest Rate 5.72%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_VariableRateAxis
= gt_VariableratecreditarrangementsMember
Short-term Debt  
Debt Instrument [Line Items]  
Credit Arrangements 447gt_CreditArrangements
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember
Debt Instrument, Unused Borrowing Capacity, Amount 417us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ShortTermDebtMember
Long-term Debt  
Debt Instrument [Line Items]  
Credit Arrangements 8,582gt_CreditArrangements
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
Debt Instrument, Unused Borrowing Capacity, Amount $ 1,900us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember