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Investments - Schedule of Mortgages by Standing (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2025	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	$ 11,185	$ 10,344
Nonaccrual Loans	147	170
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	2
ACL	(176)	(133)	$ (159)	$ (137)	$ (130)	$ (121)
Total with ACL	11,009	10,211
Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	10,978	10,089
30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	60	69
90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	16
Apartment
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(50)	(32)	(23)	(18)	(28)	(23)
Hotel
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(15)	(11)	(4)	(10)	(7)	(7)
Office
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(31)	(28)	(56)	(42)	(40)	(44)
Retail
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(26)	(17)	(30)	(24)	(19)	(19)
Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(33)	(27)	(23)	(26)	(20)	(20)
Other
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(2)	(2)	(1)	(2)	(2)	(3)
Residential
Financing Receivable, Credit Quality Indicator [Line Items]
ACL	(19)	(16)	$ (22)	$ (15)	$ (14)	$ (5)
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	9,695	9,074
Nonaccrual Loans	98	109
Non-accrual Loans with No Allowance	0	0
Interest Income on Non-accrual Loans	0	0
ACL	(157)	(117)
Total with ACL	9,538	8,957
Commercial mortgage loans \| Current
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	9,584	8,965
Commercial mortgage loans \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	13	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	3,332	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	3,315	2,866
Commercial mortgage loans \| Apartment \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	3	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	812	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	812	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	1,212	1,171
Nonaccrual Loans	84	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	1,118	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	1,650	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	1,650	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	2,266	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	2,266	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	423	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	423	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	(19)	(16)
Total with ACL	1,471	1,254
Residential mortgage loans \| Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	1,490	1,270
Nonaccrual Loans	49	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	1,394	1,124
Residential mortgage loans \| Residential \| 30-89 Days Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	47	69
Residential mortgage loans \| Residential \| 90 Days or Greater Past Due
Financing Receivable, Credit Quality Indicator [Line Items]
Accruing Loans	0	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