XML 1148 R85.htm IDEA: XBRL DOCUMENT v2.4.1.9
Loan-to-Value Analysis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan $ 7,277,776us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 6,239,870us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Mortgage Receivable    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 7,217,169us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 6,200,697us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
Mortgage loan, loan to value percentage 100.00%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 100.00%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
Mortgage Receivable | Less than 50%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 2,439,554us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember		 2,025,011us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 33.90%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember		 32.70%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember
Mortgage Receivable | 50% To 60%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 1,849,502us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioFiftyPercentToFiftyNinePointNineNinePercentMember		 1,668,987us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioFiftyPercentToFiftyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 25.60%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioFiftyPercentToFiftyNinePointNineNinePercentMember		 26.90%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioFiftyPercentToFiftyNinePointNineNinePercentMember
Mortgage Receivable | 60% To 70%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 2,072,965us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSixtyPercentToSixtyNinePointNineNinePercentMember		 1,622,171us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSixtyPercentToSixtyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 28.70%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSixtyPercentToSixtyNinePointNineNinePercentMember		 26.20%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSixtyPercentToSixtyNinePointNineNinePercentMember
Mortgage Receivable | 70% To 80%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 599,743us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSeventyPercentToSeventyNinePointNineNinePercentMember		 477,096us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSeventyPercentToSeventyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 8.30%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSeventyPercentToSeventyNinePointNineNinePercentMember		 7.70%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSeventyPercentToSeventyNinePointNineNinePercentMember
Mortgage Receivable | 80% To 90%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 209,957us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioEightyPercentToEightyNinePointNineNinePercentMember		 168,964us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioEightyPercentToEightyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 2.90%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioEightyPercentToEightyNinePointNineNinePercentMember		 2.70%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioEightyPercentToEightyNinePointNineNinePercentMember
Mortgage Receivable | 90% To 100%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 13,426us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioNinetyPercentToHundredPercentMember		  
Mortgage loan, loan to value percentage 0.20%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioNinetyPercentToHundredPercentMember		  
Mortgage Receivable | Greater than 100%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 32,022us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioGreaterThanHundredPercentMember		 238,468us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioGreaterThanHundredPercentMember
Mortgage loan, loan to value percentage 0.40%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioGreaterThanHundredPercentMember		 3.80%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioGreaterThanHundredPercentMember
Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan   578us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
Mortgage loan, loan to value percentage   100.00%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
Residential Mortgage | Less than 50%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan   578us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage   100.00%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember
Mortgage loans    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 7,217,169us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember		 6,201,275us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
Mortgage loan, loan to value percentage 100.00%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember		 100.00%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
Mortgage loans | Less than 50%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 2,439,554us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember		 2,025,589us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 33.90%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember		 32.70%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioZeroPercentToFortyNinePointNineNinePercentMember
Mortgage loans | 50% To 60%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 1,849,502us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioFiftyPercentToFiftyNinePointNineNinePercentMember		 1,668,987us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioFiftyPercentToFiftyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 25.60%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioFiftyPercentToFiftyNinePointNineNinePercentMember		 26.90%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioFiftyPercentToFiftyNinePointNineNinePercentMember
Mortgage loans | 60% To 70%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 2,072,965us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSixtyPercentToSixtyNinePointNineNinePercentMember		 1,622,171us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSixtyPercentToSixtyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 28.70%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSixtyPercentToSixtyNinePointNineNinePercentMember		 26.20%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSixtyPercentToSixtyNinePointNineNinePercentMember
Mortgage loans | 70% To 80%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 599,743us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSeventyPercentToSeventyNinePointNineNinePercentMember		 477,096us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSeventyPercentToSeventyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 8.30%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSeventyPercentToSeventyNinePointNineNinePercentMember		 7.70%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioSeventyPercentToSeventyNinePointNineNinePercentMember
Mortgage loans | 80% To 90%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 209,957us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioEightyPercentToEightyNinePointNineNinePercentMember		 168,964us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioEightyPercentToEightyNinePointNineNinePercentMember
Mortgage loan, loan to value percentage 2.90%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioEightyPercentToEightyNinePointNineNinePercentMember		 2.70%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioEightyPercentToEightyNinePointNineNinePercentMember
Mortgage loans | 90% To 100%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan 13,426us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioNinetyPercentToHundredPercentMember		  
Mortgage loan, loan to value percentage 0.20%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioNinetyPercentToHundredPercentMember		  
Mortgage loans | Greater than 100%    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage loan $ 32,022us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioGreaterThanHundredPercentMember		 $ 238,468us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioGreaterThanHundredPercentMember
Mortgage loan, loan to value percentage 0.40%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioGreaterThanHundredPercentMember		 3.80%ck0000072499_LoanToValueRatio
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ck0000072499_LoanToValueRatioGreaterThanHundredPercentMember