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SCHEDULE I - CONSOLIDATED SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Summary of investments, other than investments in related parties [Line Items]  
Cost $ 94,871us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
Carrying Value 102,967us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
Derivative instruments [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Derivative liabilities 77us-gaap_DerivativeLiabilities
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Fixed maturity AFS securities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 79,196us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 86,838us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 86,838us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Fixed maturity AFS securities [Member] | Hybrid and redeemable preferred securities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 886us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 954us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 954us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Fixed maturity AFS securities [Member] | Variable interest entities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 587us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 598us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 598us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Equity AFS securities [Member] | Trading securities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 1,764us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 2,065us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 2,065us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Equity AFS securities [Member] | Mortgage loans on real estate [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 7,574us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 8,038us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 7,574us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Equity AFS securities [Member] | Real estate [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 20us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Carrying Value 20us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Equity AFS securities [Member] | Policy loans [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 2,670us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Carrying Value 2,670us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Equity AFS securities [Member] | Derivative instruments [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 1,722us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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[1]
Fair Value 1,860us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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[1]
Carrying Value 1,860us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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[1]
Equity AFS securities [Member] | Other investments [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 1,709us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 1,709us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 1,709us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Bonds | Fixed maturity AFS securities [Member] | U.S. government and government agencies and authorities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 379us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 435us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 435us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Bonds | Fixed maturity AFS securities [Member] | Asset-backed Securities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 1,491us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 1,536us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 1,536us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Bonds | Fixed maturity AFS securities [Member] | State and municipal bonds [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 3,723us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 4,593us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 4,593us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Bonds | Fixed maturity AFS securities [Member] | Mortgage-backed securities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 4,533us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 4,796us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 4,796us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Bonds | Fixed maturity AFS securities [Member] | Foreign governments [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 473us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 541us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 541us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Bonds | Fixed maturity AFS securities [Member] | Public utilities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 11,356us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 12,786us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 12,786us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Bonds | Fixed maturity AFS securities [Member] | All other corporate bonds [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 55,768us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 60,599us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 60,599us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Common Stock | Equity AFS securities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 216us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 231us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 231us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Common Stock | Equity AFS securities [Member] | Banks, trusts, and insurance companies [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 191us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 195us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value 195us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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Common Stock | Equity AFS securities [Member] | Nonredeemable preferred securities [Member]  
Summary of investments, other than investments in related parties [Line Items]  
Cost 25us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost
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Fair Value 36us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue
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Carrying Value $ 36us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount
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[1] Derivative investment assets were offset by $77 million in derivative liabilities reflected in other liabilities on our Consolidated Balance Sheets