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Investments - Interest and Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Investments [Line Items]
Gross investment income	$ 511	$ 556	$ 1,036	$ 997
Investment expense	(48)	(42)	(95)	(81)
Interest and investment income	463	514	941	916
Fixed maturity securities, available-for-sale
Schedule of Investments [Line Items]
Gross investment income	350	325	682	631
Equity securities
Schedule of Investments [Line Items]
Gross investment income	7	5	15	10
Preferred securities
Schedule of Investments [Line Items]
Gross investment income	20	18	35	32
Mortgage loans
Schedule of Investments [Line Items]
Gross investment income	49	33	88	56
Invested cash and short-term investments
Schedule of Investments [Line Items]
Gross investment income	13	1	18	1
Limited partnerships
Schedule of Investments [Line Items]
Gross investment income	58	164	171	244
Tax deferred property exchange income
Schedule of Investments [Line Items]
Gross investment income	10	4	14	9
Other investments
Schedule of Investments [Line Items]
Gross investment income	$ 4	$ 6	$ 13	$ 14

X

- Definition

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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- Definition

Amount of expenses related to the generation of investment income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 944
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