XML 1079 R55.htm IDEA: XBRL DOCUMENT v2.4.1.9
Organization - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2014
fixed-indexed annuities  
Organization and Nature of Operations [Line Items]  
Percentage of net premium written 85.00%ck0000072499_PercentageOfNetPremiumsWritten
/ us-gaap_ProductOrServiceAxis
= ck0000072499_FixedAnnuitiesMember
Variable annuity  
Organization and Nature of Operations [Line Items]  
Percentage of net premium written 15.00%ck0000072499_PercentageOfNetPremiumsWritten
/ us-gaap_ProductOrServiceAxis
= us-gaap_VariableAnnuityMember
Annuities  
Organization and Nature of Operations [Line Items]  
Percentage of net premium written 96.00%ck0000072499_PercentageOfNetPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_InvestmentsSegmentMember
Life  
Organization and Nature of Operations [Line Items]  
Percentage of net premium written 3.00%ck0000072499_PercentageOfNetPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_LifeInsuranceSegmentMember
Accident and health  
Organization and Nature of Operations [Line Items]  
Percentage of net premium written 1.00%ck0000072499_PercentageOfNetPremiumsWritten
/ us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAxis
= us-gaap_AccidentAndHealthInsuranceSegmentMember