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Investments -Interest and Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Investments [Line Items]
Gross investment income	$ 556	$ 163	$ 997	$ 216
Investment expense	(42)	(11)	(81)	(11)
Interest and investment income	514	152	916	205
Fixed maturity securities, available-for-sale
Schedule of Investments [Line Items]
Gross investment income	325	117	631	134
Equity securities
Schedule of Investments [Line Items]
Gross investment income	5	13	10	17
Preferred securities
Schedule of Investments [Line Items]
Gross investment income	18	11	32	17
Mortgage loans
Schedule of Investments [Line Items]
Gross investment income	33	7	56	7
Invested cash and short-term investments
Schedule of Investments [Line Items]
Gross investment income	1	8	1	33
Limited partnerships
Schedule of Investments [Line Items]
Gross investment income	164	0	244	0
Tax deferred property exchange income
Schedule of Investments [Line Items]
Gross investment income	4	0	9	0
Other investments
Schedule of Investments [Line Items]
Gross investment income	$ 6	$ 7	$ 14	$ 8

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

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

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-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
-SubTopic 220
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