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Other Assets and Investments (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Long Lived Assets Held-for-sale [Line Items]      
Investment Owned, Balance, Shares 3,421,306us-gaap_InvestmentOwnedBalanceShares 3,421,306us-gaap_InvestmentOwnedBalanceShares  
Investment Owned, at Fair Value $ 51us-gaap_InvestmentOwnedAtFairValue $ 49us-gaap_InvestmentOwnedAtFairValue  
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 35us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax 33us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax  
Available-for-sale Securities Gross Unrealized Holding Gains After Tax 36gt_AvailableForSaleSecuritiesGrossUnrealizedHoldingGainsAfterTax 34gt_AvailableForSaleSecuritiesGrossUnrealizedHoldingGainsAfterTax  
Proceeds from Dividends Received 273us-gaap_ProceedsFromDividendsReceived 88us-gaap_ProceedsFromDividendsReceived 129us-gaap_ProceedsFromDividendsReceived
Equity Method Investment, Dividends or Distributions $ 24us-gaap_EquityMethodInvestmentDividendsOrDistributions $ 21us-gaap_EquityMethodInvestmentDividendsOrDistributions $ 11us-gaap_EquityMethodInvestmentDividendsOrDistributions