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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	$ 11,101	$ 10,687
Fixed maturities, available for sale, allowance for expected credit losses	21	34	$ 12	$ 11
Available for sale (AFS) fixed maturities	11,052	10,398
Total fixed maturities
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	11,101	10,687
Fixed maturities, available for sale, allowance for expected credit losses	21	34
Gross unrealized gains on available for sale fixed maturities	165	98
Gross unrealized losses on available for sale fixed maturities	(193)	(353)
Net unrealized gain (loss) on available for sale fixed maturities	(28)	(255)
Available for sale (AFS) fixed maturities	11,052	10,398
U.S. government and government agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	160	176
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Gross unrealized gains on available for sale fixed maturities	1	0
Gross unrealized losses on available for sale fixed maturities	0	(3)
Net unrealized gain (loss) on available for sale fixed maturities	1	(3)
Available for sale (AFS) fixed maturities	161	173
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	853	905
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Gross unrealized gains on available for sale fixed maturities	8	3
Gross unrealized losses on available for sale fixed maturities	(26)	(49)
Net unrealized gain (loss) on available for sale fixed maturities	(18)	(46)
Available for sale (AFS) fixed maturities	835	859
Foreign government
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	236	236
Fixed maturities, available for sale, allowance for expected credit losses	0	0
Gross unrealized gains on available for sale fixed maturities	2	2
Gross unrealized losses on available for sale fixed maturities	0	(1)
Net unrealized gain (loss) on available for sale fixed maturities	2	1
Available for sale (AFS) fixed maturities	238	237
Residential MBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	2,808	2,122
Fixed maturities, available for sale, allowance for expected credit losses	1	1
Gross unrealized gains on available for sale fixed maturities	43	22
Gross unrealized losses on available for sale fixed maturities	(103)	(154)
Net unrealized gain (loss) on available for sale fixed maturities	(60)	(132)
Available for sale (AFS) fixed maturities	2,747	1,989
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	1,167	1,243
Fixed maturities, available for sale, allowance for expected credit losses	5	4
Gross unrealized gains on available for sale fixed maturities	1	10
Gross unrealized losses on available for sale fixed maturities	(3)	(12)
Net unrealized gain (loss) on available for sale fixed maturities	(2)	(2)
Available for sale (AFS) fixed maturities	1,160	1,237
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	2,539	2,463
Fixed maturities, available for sale, allowance for expected credit losses	5	6
Gross unrealized gains on available for sale fixed maturities	29	19
Gross unrealized losses on available for sale fixed maturities	(38)	(69)
Net unrealized gain (loss) on available for sale fixed maturities	(9)	(50)
Available for sale (AFS) fixed maturities	2,525	2,407
Corporate and other
Debt Securities, Available-for-sale [Line Items]
Fixed maturies, available for sale, amortized cost	3,338	3,542
Fixed maturities, available for sale, allowance for expected credit losses	10	23	$ 3	$ 1
Gross unrealized gains on available for sale fixed maturities	81	42
Gross unrealized losses on available for sale fixed maturities	(23)	(65)
Net unrealized gain (loss) on available for sale fixed maturities	58	(23)
Available for sale (AFS) fixed maturities	$ 3,386	$ 3,496

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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