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Schedule I - Summary of Investments Other than Investments in Related Parties (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | $ 80,176
Amount at which shown in the Balance Sheet | 82,803
United States government, government agencies and authorities |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 3,580
Fair value | 3,616
Amount at which shown in the Balance Sheet | 3,616
States, municipalities and political subdivisions |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 8,053
Fair value | 8,328
Amount at which shown in the Balance Sheet | 8,328
Foreign governments |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 1,005
Fair value | 1,021
Amount at which shown in the Balance Sheet | 1,021
Public utilities |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 5,655
Fair value | 5,988
Amount at which shown in the Balance Sheet | 5,988
All other corporate bonds |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 37,341
Fair value | 38,038
Amount at which shown in the Balance Sheet | 38,038
Asset-backed securities |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 1,266
Fair value | 1,272
Amount at which shown in the Balance Sheet | 1,272
Residential mortgage-backed securities |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 480
Fair value | 578
Amount at which shown in the Balance Sheet | 578
Commercial mortgage-backed securities |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 124
Fair value | 128
Amount at which shown in the Balance Sheet | 128
Redeemable preferred stock |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 21
Fair value | 23
Amount at which shown in the Balance Sheet | 23
Fixed income securities |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 57,525
Fair value | 58,992
Amount at which shown in the Balance Sheet | 58,992
Public utilities |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 84
Fair value | 99
Amount at which shown in the Balance Sheet | 99
Banks, trusts and insurance companies |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 565
Fair value | 725
Amount at which shown in the Balance Sheet | 725
Industrial, miscellaneous and all other |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 4,591
Fair value | 5,506
Amount at which shown in the Balance Sheet | 5,506
Nonredeemable preferred stocks |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 221
Fair value | 291
Amount at which shown in the Balance Sheet | 291
Equity securities |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 5,461
Fair value | 6,621
Amount at which shown in the Balance Sheet | 6,621
Mortgage loans on real estate |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 4,534
Fair value | 4,732
Amount at which shown in the Balance Sheet | 4,534
Real estate |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 468
Amount at which shown in the Balance Sheet | 468
Real estate acquired in satisfaction of debt |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 0
Amount at which shown in the Balance Sheet | 0
Policy loans |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 905
Amount at which shown in the Balance Sheet | 905
Derivative instruments |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 127
Fair value | 127
Amount at which shown in the Balance Sheet | 127
Limited partnership interests |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 6,740
Amount at which shown in the Balance Sheet | 6,740
Other long-term investments |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 2,472
Amount at which shown in the Balance Sheet | 2,472
Short-term investments |
Summary of Investments Other Than Investments in Related Parties |
Cost/amortized cost | 1,944
Fair value | 1,944
Amount at which shown in the Balance Sheet | $ 1,944

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- Definition This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010 + Details
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- Definition This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010 + Details
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- Definition This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010 + Details
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