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Commitments and Contingencies - Narrative (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Commitment and Contingencies [Line Items]    
Face amount of debt 8,400,000,000us-gaap_DebtInstrumentFaceAmount $ 4,000,000,000us-gaap_DebtInstrumentFaceAmount
Estimate of possible loss 118,000,000us-gaap_LossContingencyEstimateOfPossibleLoss  
Loss contingency accrual 52,000,000us-gaap_LossContingencyAccrualAtCarryingValue  
Indirect tax contingency 60,000,000acf_IndirectTaxContingency  
Geographic Concentration Risk [Member] | Accounts Receivable [Member]    
Commitment and Contingencies [Line Items]    
Concentration risk (percent) 16.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
 
Brazil [Member] | Geographic Concentration Risk [Member] | Accounts Receivable [Member]    
Commitment and Contingencies [Line Items]    
Concentration risk (percent) 30.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_BR
 
Germany [Member] | Geographic Concentration Risk [Member] | Accounts Receivable [Member]    
Commitment and Contingencies [Line Items]    
Concentration risk (percent) 20.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_DE
 
U.K. [Member] | Geographic Concentration Risk [Member] | Accounts Receivable [Member]    
Commitment and Contingencies [Line Items]    
Concentration risk (percent) 23.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_GB
 
Administrative Offices And Other [Member] | Maximum [Member]    
Commitment and Contingencies [Line Items]    
Term of contract 10 years