Investments - Mortgage Loans, Net by Property Type and Geographic Region (Details) - Commercial mortgage loans - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2026
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 39,071	$ 48,291
Property Type Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	100.00%	100.00%
Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	100.00%	100.00%
Total U.S. Region
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 31,303	36,102
Total U.S. Region \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	74.80%	80.10%
East North Central
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 1,883	2,451
East North Central \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	5.10%	4.80%
East South Central
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 447	381
East South Central \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	0.80%	1.10%
Middle Atlantic
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 9,323	10,747
Middle Atlantic \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	22.30%	23.90%
Mountain
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 1,605	1,877
Mountain \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	3.90%	4.10%
New England
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 1,088	1,184
New England \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	2.50%	2.80%
Pacific
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 6,021	6,143
Pacific \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	12.70%	15.40%
South Atlantic
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 6,919	8,404
South Atlantic \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	17.40%	17.70%
West North Central
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 842	787
West North Central \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	1.60%	2.20%
West South Central
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 3,175	4,128
West South Central \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	8.50%	8.10%
UNITED KINGDOM
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 3,085	5,336
UNITED KINGDOM \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	11.00%	7.90%
Other
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 4,683	6,853
Other \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	14.20%	12.00%
International
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 7,768	12,189
International \| Geographic Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	25.20%	19.90%
Hotels
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 2,773	5,072
Hotels \| Property Type Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	10.50%	7.10%
Retail
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 2,061	2,591
Retail \| Property Type Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	5.40%	5.30%
Office building
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 4,530	6,367
Office building \| Property Type Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	13.20%	11.60%
Industrial
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 8,778	10,467
Industrial \| Property Type Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	21.60%	22.50%
Apartment
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 15,458	15,640
Apartment \| Property Type Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	32.40%	39.50%
Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans, net of allowances		$ 5,471	$ 8,154
Other commercial \| Property Type Concentration Risk \| Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage concentration risk	16.90%	14.00%