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Investments - Assets Pledged as Collateral (Details) - Asset Pledged as Collateral - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	$ 4,937	$ 5,482
Fixed maturity AFS securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	2,299	1,737
Trading securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	24	24
Equity securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	3	12
Mortgage loans on real estate
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	2,486	3,530
Cash and invested cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	54	111
Other investments
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total assets pledged as collateral	$ 71	$ 68

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481444/860-30-45-1

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- Definition

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 320
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479035/940-320-45-2

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