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Investments - Schedule of Commercial Mortgage Loans and Residential Mortgage Loans (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans	$ 10,444	$ 10,211
Financing receivables, accrued interest receivable	48		$ 42
Mortgage loans, allowance for credit loss	159	133	$ 130	$ 121
Commercial mortgage loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans	9,137	8,957
Mortgage loans, allowance for credit loss	137	117
Residential mortgage loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans	1,307	1,254
Mortgage loans, allowance for credit loss	22	16
Commercial mortgage loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans	9,137	8,957
Financing receivables, accrued interest receivable	35	34
Residential mortgage loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage loans	1,307	1,254
Financing receivables, accrued interest receivable	$ 13	$ 13