Investments - Schedule of Payment Status of Mortgage Loans (Details) - Mortgage loans - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	$ 855	$ 889
Allowance	(13)	(10)
Total mortgage loans	842	879
Less than 90 days past due
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	1	2
90 days or greater past due
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	3	2
Total past due before allowance
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	4	4
Current before allowance
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	851	885
Commercial
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	558	628
Allowance	(10)	(9)
Total mortgage loans	548	619
Commercial \| Less than 90 days past due
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0	0
Commercial \| 90 days or greater past due
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0	0
Commercial \| Total past due before allowance
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	0	0
Commercial \| Current before allowance
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	558	628
Residential
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	297	261
Allowance	(3)	(1)
Total mortgage loans	294	260
Residential \| Less than 90 days past due
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	1	2
Residential \| 90 days or greater past due
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	3	2
Residential \| Total past due before allowance
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	4	4
Residential \| Current before allowance
Debt Securities, Available-for-Sale [Line Items]
Amortized cost before allowance	$ 293	$ 257