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Mortgage Loans on Real Estate - Commercial Loan Portfolio Summary (Details) - Mortgage loans on real estate, net of allowance - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	May 25, 2022	May 24, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 12,272	$ 5,711
Allowance for credit losses	(155)	(53)	$ (38)	$ 0	$ (93)	$ (97)
Mortgage loans, carrying value	12,117	5,658
Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	9,576	5,711
Allowance for credit losses	(146)	(53)	$ (38)	$ 0	$ (93)	$ (97)
Mortgage loans, carrying value	$ 9,430	$ 5,658
Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	100.00%	100.00%
Commercial Mortgage | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 447	$ 0
Commercial Mortgage | Agricultural | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	4.70%	0.00%
Commercial Mortgage | Apartment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 2,325	$ 1,091
Commercial Mortgage | Apartment | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	24.30%	19.10%
Commercial Mortgage | Hotel
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,246	$ 966
Commercial Mortgage | Hotel | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	13.00%	16.90%
Commercial Mortgage | Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,859	$ 1,052
Commercial Mortgage | Industrial | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	19.40%	18.40%
Commercial Mortgage | Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,425	$ 999
Commercial Mortgage | Office | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	14.90%	17.50%
Commercial Mortgage | Parking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 326	$ 414
Commercial Mortgage | Parking | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	3.40%	7.20%
Commercial Mortgage | Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,572	$ 781
Commercial Mortgage | Retail | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	16.40%	13.70%
Commercial Mortgage | Storage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 176	$ 118
Commercial Mortgage | Storage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	1.80%	2.10%
Commercial Mortgage | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 200	$ 290
Commercial Mortgage | Other | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	2.10%	5.10%
Pacific | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 2,060	$ 905
Pacific | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	21.50%	15.90%
Mountain | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,678	$ 1,327
Mountain | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	17.50%	23.20%
West North Central | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 280	$ 178
West North Central | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	2.90%	3.10%
West South Central | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,443	$ 1,081
West South Central | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	15.10%	18.90%
East North Central | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,012	$ 829
East North Central | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	10.60%	14.50%
East South Central | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 144	$ 50
East South Central | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	1.50%	0.90%
Middle Atlantic | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 591	$ 129
Middle Atlantic | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	6.20%	2.30%
South Atlantic | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,993	$ 1,000
South Atlantic | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	20.80%	17.50%
New England | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 133	$ 12
New England | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	1.40%	0.20%
Other | Commercial Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 242	$ 200
Other | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	2.50%	3.50%

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