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Investments - Interest and Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Investments [Line Items]
Gross investment income	$ 551	$ 367	$ 1,549	$ 584
Investment expense	(43)	(31)	(125)	(43)
Interest and investment income	508	336	1,424	541
Fixed maturity securities, available-for-sale
Schedule of Investments [Line Items]
Gross investment income	313	286	944	419
Equity securities
Schedule of Investments [Line Items]
Gross investment income	6	5	16	14
Preferred securities
Schedule of Investments [Line Items]
Gross investment income	13	15	45	40
Mortgage loans
Schedule of Investments [Line Items]
Gross investment income	34	24	90	31
Invested cash and short-term investments
Schedule of Investments [Line Items]
Gross investment income	4	0	5	8
Limited partnerships
Schedule of Investments [Line Items]
Gross investment income	168	25	412	25
Tax deferred property exchange income
Schedule of Investments [Line Items]
Gross investment income	4	5	13	28
Other investments
Schedule of Investments [Line Items]
Gross investment income	$ 9	$ 7	$ 24	$ 19

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 http://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
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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-Topic 944
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-Section S99
-Paragraph 1
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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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