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Schedule I Summary of Investments - Other Than Investments in Affiliates (Details) $ in Millions	Dec. 31, 2018 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	$ 46,802
Amount at which shown on Balance Sheet	46,790
U.S. government and government agencies and authorities (guaranteed and sponsored)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	4,446
Fair Value	4,430
Amount at which shown on Balance Sheet	4,430
States, municipalities and political subdivisions
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	9,972
Fair Value	10,346
Amount at which shown on Balance Sheet	10,346
Foreign government
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	866
Fair Value	847
Amount at which shown on Balance Sheet	847
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	2,017
Fair Value	1,991
Amount at which shown on Balance Sheet	1,991
All other corporate bonds
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	11,679
Fair Value	11,407
Amount at which shown on Balance Sheet	11,407
All other mortgage-backed and asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	6,623
Fair Value	6,631
Amount at which shown on Balance Sheet	6,631
Total fixed maturities, available-for-sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	35,603
Fair Value	35,652
Amount at which shown on Balance Sheet	35,652
Fixed maturities, at fair value using fair value option
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	21
Fair Value	22
Amount at which shown on Balance Sheet	22
Total fixed maturities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	35,624
Fair Value	35,674
Amount at which shown on Balance Sheet	35,674
Industrial, miscellaneous and all other
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,170
Fair Value	1,170
Amount at which shown on Balance Sheet	1,170
Non-redeemable preferred stocks
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	44
Fair Value	44
Amount at which shown on Balance Sheet	44
Equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,214
Fair Value	1,214
Amount at which shown on Balance Sheet	1,214
Mortgage loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	3,704
Fair Value	3,746
Amount at which shown on Balance Sheet	3,704
Futures, options and miscellaneous
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	254
Fair Value	192
Amount at which shown on Balance Sheet	192
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	4,282
Fair Value	4,283
Amount at which shown on Balance Sheet	4,283
Investments in partnerships and trusts
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,723
Amount at which shown on Balance Sheet	$ 1,723

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Amount of investment held by insurance company, excluding investment in related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column D))
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Cost of investment held by insurance company, excluding investment in related party.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column B))
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-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column C))
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