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Borrowings (Details 4) (Reverse repurchase agreements, USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reverse repurchase agreements
      
Borrowings      
2018 $ 200,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		    
2019 600,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		    
2020 300,000,000af_LongTermDebtMaturitiesRepaymentsofPrincipalinYearSix
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		    
Total 1,100,000,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		 1,100,000,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		 1,100,000,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Callable in 2015 100,000,000af_LongTermDebtMaturitiesRepaymentsofPrincipalCallablewithinoneyear
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		    
Callable in 2016 100,000,000af_LongTermDebtMaturitiesRepaymentsofPrincipalCallableinSpecifiedPeriodTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember		    
Callable in 2017 $ 100,000,000af_LongTermDebtMaturitiesRepaymentsofPrincipalCallableinSpecifiedPeriodThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember