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Investments - Schedule of Mortgages by Standing (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	$ 10,603	$ 10,344
Nonaccrual loans	134	170
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	2
ACL	(159)	(133)	$ (130)	$ (121)
Total with ACL	10,444	10,211
Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	10,381	10,089
30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	67	69
90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	21	16
Apartment
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(23)	(32)	(28)	(23)
Hotel
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(4)	(11)	(7)	(7)
Office
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(56)	(28)	(40)	(44)
Retail
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(30)	(17)	(19)	(19)
Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(23)	(27)	(20)	(20)
Other
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(1)	(2)	(2)	(3)
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(22)	(16)	$ (14)	$ (5)
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	9,274	9,074
Nonaccrual loans	99	109
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	0
ACL	(137)	(117)
Total with ACL	9,137	8,957
Commercial mortgage loans \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	9,159	8,965
Commercial mortgage loans \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	16	0
Commercial mortgage loans \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Apartment
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	3,211	2,866
Nonaccrual loans	16	0
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	0
Commercial mortgage loans \| Apartment \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	3,189	2,866
Commercial mortgage loans \| Apartment \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	6	0
Commercial mortgage loans \| Apartment \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Hotel
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	762	789
Nonaccrual loans	0	0
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	0
Commercial mortgage loans \| Hotel \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	762	789
Commercial mortgage loans \| Hotel \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Hotel \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Office
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	1,149	1,171
Nonaccrual loans	83	109
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	0
Commercial mortgage loans \| Office \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	1,056	1,062
Commercial mortgage loans \| Office \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	10	0
Commercial mortgage loans \| Office \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	1,652	1,664
Nonaccrual loans	0	0
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	0
Commercial mortgage loans \| Retail \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	1,652	1,664
Commercial mortgage loans \| Retail \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Retail \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	2,136	2,217
Nonaccrual loans	0	0
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	0
Commercial mortgage loans \| Warehouse \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	2,136	2,217
Commercial mortgage loans \| Warehouse \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Warehouse \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	364	367
Nonaccrual loans	0	0
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	0
Commercial mortgage loans \| Other \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	364	367
Commercial mortgage loans \| Other \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Commercial mortgage loans \| Other \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	0
Residential mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(22)	(16)
Total with ACL	1,307	1,254
Residential mortgage loans \| Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	1,329	1,270
Nonaccrual loans	35	61
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	2
Residential mortgage loans \| Residential \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	1,222	1,124
Residential mortgage loans \| Residential \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	51	69
Residential mortgage loans \| Residential \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	21	16
Residential mortgage loans \| Residential Real Estate With Supported Guarantees \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	15	19
Residential mortgage loans \| Residential Real Estate With Supported Guarantees \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	$ 21	$ 16