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DAI-ICHI MERGER (Details) (USD $)
In Billions, except Per Share data, unless otherwise specified
 0 Months Ended
Feb. 01, 2015
Feb. 01, 2015
Dai-ichi merger    
Per share merger consideration (in dollars per share) $ 70.00us-gaap_BusinessAcquisitionSharePrice $ 70.00us-gaap_BusinessAcquisitionSharePrice
Dai-ichi Life | Subsequent event | Protective Life Corporation    
Dai-ichi merger    
Per share merger consideration (in dollars per share) $ 70us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= pl_ProtectiveLifeCorporationMember
/ dei_LegalEntityAxis
= pl_DaiIchiLifeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 $ 70us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= pl_ProtectiveLifeCorporationMember
/ dei_LegalEntityAxis
= pl_DaiIchiLifeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Aggregate cash consideration $ 5.6us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= pl_ProtectiveLifeCorporationMember
/ dei_LegalEntityAxis
= pl_DaiIchiLifeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember