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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 12,277		$ 11,101
Allowance for Expected Credit Losses	27	$ 25	21	$ 16	$ 15	$ 34
Available for sale (AFS) fixed maturities	11,771		11,052
Total fixed maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,277		11,101
Allowance for Expected Credit Losses	27		21
Gross unrealized, gains	29		165
Gross unrealized, losses	(508)		(193)
Net Unrealized	(479)		(28)
Available for sale (AFS) fixed maturities	11,771		11,052
U.S. government and government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	136		160
Allowance for Expected Credit Losses	0		0
Gross unrealized, gains	0		1
Gross unrealized, losses	(4)		0
Net Unrealized	(4)		1
Available for sale (AFS) fixed maturities	132		161
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	768		853
Allowance for Expected Credit Losses	0		0
Gross unrealized, gains	1		8
Gross unrealized, losses	(71)		(26)
Net Unrealized	(70)		(18)
Available for sale (AFS) fixed maturities	698		835
Foreign government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	230		236
Allowance for Expected Credit Losses	0		0
Gross unrealized, gains	0		2
Gross unrealized, losses	(2)		0
Net Unrealized	(2)		2
Available for sale (AFS) fixed maturities	228		238
Residential MBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,714		2,808
Allowance for Expected Credit Losses	2		1
Gross unrealized, gains	11		43
Gross unrealized, losses	(266)		(103)
Net Unrealized	(255)		(60)
Available for sale (AFS) fixed maturities	3,457		2,747
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,244		1,167
Allowance for Expected Credit Losses	4		5
Gross unrealized, gains	1		1
Gross unrealized, losses	(4)		(3)
Net Unrealized	(3)		(2)
Available for sale (AFS) fixed maturities	1,237		1,160
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,753		2,539
Allowance for Expected Credit Losses	5		5
Gross unrealized, gains	4		29
Gross unrealized, losses	(80)		(38)
Net Unrealized	(76)		(9)
Available for sale (AFS) fixed maturities	2,672		2,525
Corporate and other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,432		3,338
Allowance for Expected Credit Losses	16	$ 14	10	$ 5	$ 5	$ 23
Gross unrealized, gains	12		81
Gross unrealized, losses	(81)		(23)
Net Unrealized	(69)		58
Available for sale (AFS) fixed maturities	$ 3,347		$ 3,386