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Subsequent Event Subsequent Event (Narrative) (Details) (Subsequent Event [Member], USD $)
0 Months Ended
Apr. 01, 2015
Apr. 01, 2015
Subsequent Event [Member]
   
Subsequent Event [Line Items]    
Business Acquisition, Effective Date of Acquisition Apr. 01, 2015  
Business Acquisition, Percentage of Voting Interests Acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
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100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
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Business Acquisition, Name of Acquired Entity Aurora National Life Assurance Company  
Payments to Acquire Businesses, Gross $ 200,000,000us-gaap_PaymentsToAcquireBusinessesGross
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 3,700,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
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3,700,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities $ 3,500,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
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$ 3,500,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
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