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Investments - Major Sources of Interest and Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Gross investment income	$ (2,088)	$ (2,128)	$ (978)
Investment expense	(197)	(167)	(78)
Interest and investment income	1,891	1,961	900
Fixed maturity securities, available-for-sale
Schedule of Investments [Line Items]
Gross investment income	(1,489)	(1,267)	(708)
Equity securities
Schedule of Investments [Line Items]
Gross investment income	(31)	(23)	(19)
Preferred securities
Schedule of Investments [Line Items]
Gross investment income	(67)	(63)	(59)
Mortgage loans
Schedule of Investments [Line Items]
Gross investment income	(186)	(131)	(50)
Invested cash and short-term investments
Schedule of Investments [Line Items]
Gross investment income	(61)	(7)	(8)
Limited partnerships
Schedule of Investments [Line Items]
Gross investment income	(110)	(589)	(76)
Tax deferred property exchange income
Schedule of Investments [Line Items]
Gross investment income	(103)	(16)	(33)
Other investments
Schedule of Investments [Line Items]
Gross investment income	$ (41)	$ (32)	$ (25)

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)
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+ 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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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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-Topic 944
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