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Mortgage Loans on Real Estate - Commercial Loan Portfolio Summary (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, accrued interest, after allowance for credit loss	$ 94	$ 27
Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	12,096	5,711
Allowance for credit losses	(54)	(53)	$ (54)	$ (43)	$ (49)	$ (38)
Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	9,175	5,711
Allowance for credit losses	(54)	(53)	$ (54)	$ (43)	$ (49)	$ (38)
Financing receivable, accrued interest, after allowance for credit loss	$ 9,121	$ 5,658
Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	100.00%	100.00%
Commercial Mortgage | Apartment | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 2,063	$ 1,091
Commercial Mortgage | Apartment | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	22.50%	19.10%
Commercial Mortgage | Hotel | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,210	$ 966
Commercial Mortgage | Hotel | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	13.20%	16.90%
Commercial Mortgage | Industrial | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,926	$ 1,052
Commercial Mortgage | Industrial | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	21.00%	18.40%
Commercial Mortgage | Office | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,222	$ 999
Commercial Mortgage | Office | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	13.30%	17.50%
Commercial Mortgage | Parking | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 319	$ 414
Commercial Mortgage | Parking | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	3.50%	7.20%
Commercial Mortgage | Retail | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,479	$ 781
Commercial Mortgage | Retail | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	16.10%	13.70%
Commercial Mortgage | Storage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 180	$ 118
Commercial Mortgage | Storage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	2.00%	2.10%
Commercial Mortgage | Other | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 776	$ 290
Commercial Mortgage | Other | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	8.40%	5.10%
Pacific | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,804	$ 905
Pacific | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	19.70%	15.90%
Mountain | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,802	$ 1,327
Mountain | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	19.60%	23.20%
West North Central | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 280	$ 178
West North Central | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	3.10%	3.10%
West South Central | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,436	$ 1,081
West South Central | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	15.60%	18.90%
East North Central | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,040	$ 829
East North Central | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	11.30%	14.50%
East South Central | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 150	$ 50
East South Central | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	1.60%	0.90%
Middle Atlantic | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 374	$ 129
Middle Atlantic | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	4.10%	2.30%
South Atlantic | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 1,982	$ 1,000
South Atlantic | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	21.60%	17.50%
New England | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 106	$ 12
New England | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	1.20%	0.20%
Other | Commercial Mortgage | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost	$ 201	$ 200
Other | Commercial Mortgage | Geographic Concentration Risk | Financing Receivables | Mortgage Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage	2.20%	3.50%

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