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Investments - Schedule of Mortgages by Standing (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2026	Dec. 31, 2025	Jun. 30, 2026	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	$ 11,459	$ 10,344
Nonaccrual Loans	51	170
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	2
ACL	(191)	(133)	$ (176)	$ (143)	$ (137)	$ (121)
Total with ACL	11,268	10,211
Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	11,338	10,089
30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	53	69
90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	17	16
Apartment
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(27)	(32)	(50)	(35)	(18)	(23)
Hotel
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(18)	(11)	(15)	(16)	(10)	(7)
Office
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(73)	(28)	(31)	(24)	(42)	(44)
Retail
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(20)	(17)	(26)	(11)	(24)	(19)
Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(24)	(27)	(33)	(32)	(26)	(20)
Other
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(1)	(2)	(2)	(3)	(2)	(3)
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(28)	(16)	$ (19)	$ (22)	$ (15)	$ (5)
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	9,576	9,074
Nonaccrual Loans	14	109
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	0
ACL	(163)	(117)
Total with ACL	9,413	8,957
Commercial mortgage loans \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	9,551	8,965
Commercial mortgage loans \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	11	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	3,463	2,866
Nonaccrual Loans	14	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	3,447	2,866
Commercial mortgage loans \| Apartment \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	2	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	805	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	805	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	1,007	1,171
Nonaccrual Loans	0	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	998	1,062
Commercial mortgage loans \| Office \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	9	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	1,395	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	1,395	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	2,557	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	2,557	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	349	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	349	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	(28)	(16)
Total with ACL	1,855	1,254
Residential mortgage loans \| Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	1,883	1,270
Nonaccrual Loans	37	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	1,787	1,124
Residential mortgage loans \| Residential \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	42	69
Residential mortgage loans \| Residential \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	17	16
Residential mortgage loans \| Residential Real Estate With Supported Guarantees \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	16	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	$ 17	$ 16