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Recent Accounting Pronouncements (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Recent Accounting Pronouncements        
Retained earnings $ 8,469us-gaap_RetainedEarningsAccumulatedDeficit $ 7,289us-gaap_RetainedEarningsAccumulatedDeficit    
Accumulated other comprehensive income, net of tax 662us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 595us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Total equity 9,305us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 9,232us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 9,712us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 9,694us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts [Member] | Cumulative effect of change in accounting policies, net of tax [Member]        
Recent Accounting Pronouncements        
Retained earnings     1,400us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
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/ us-gaap_StatementScenarioAxis
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Accumulated other comprehensive income, net of tax     113us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_AccountingStandardsUpdate201026Member
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
 
Total equity     $ 1,300us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_AccountingStandardsUpdate201026Member
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember