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Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss				$ 4,215
Financing Receivable, Allowance for Credit Loss				0
Financing Receivable, after Allowance for Credit Loss	$ 6,000	$ 5,383		4,215
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 6,036	$ 5,412
Percent of Total	100.00%	100.00%
Financing Receivable, Allowance for Credit Loss	$ 36	$ 29	$ 38	$ 0
Financing Receivable, after Allowance for Credit Loss	6,000	5,383
Commercial Loan [Member] | Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,217	$ 1,931
Percent of Total	36.70%	35.70%
Commercial Loan [Member] | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,247	$ 1,833
Percent of Total	37.20%	33.90%
Commercial Loan [Member] | Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 585	$ 627
Percent of Total	9.70%	11.60%
Commercial Loan [Member] | Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 947	$ 951
Percent of Total	15.70%	17.60%
Commercial Loan [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 0	$ 30
Percent of Total	0.00%	0.50%
Commercial Loan [Member] | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 40	$ 40
Percent of Total	0.70%	0.70%
Commercial Loan [Member] | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	100.00%	100.00%
Commercial Loan [Member] | Mortgage loans | Financial Asset, Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 0	$ 0
Commercial Loan [Member] | East North Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 317	$ 284
Commercial Loan [Member] | East North Central | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	5.30%	5.20%
Commercial Loan [Member] | Middle Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 316	$ 303
Commercial Loan [Member] | Middle Atlantic | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	5.20%	5.60%
Commercial Loan [Member] | Mountain
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 707	$ 450
Commercial Loan [Member] | Mountain | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	11.70%	8.30%
Commercial Loan [Member] | New England
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 395	$ 393
Commercial Loan [Member] | New England | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	6.50%	7.30%
Commercial Loan [Member] | Pacific
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 1,299	$ 1,245
Commercial Loan [Member] | Pacific | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	21.50%	23.00%
Commercial Loan [Member] | South Atlantic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 1,670	$ 1,556
Commercial Loan [Member] | South Atlantic | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	27.70%	28.80%
Commercial Loan [Member] | West North Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 105	$ 85
Commercial Loan [Member] | West North Central | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	1.70%	1.60%
Commercial Loan [Member] | West South Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 421	$ 424
Commercial Loan [Member] | West South Central | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	7.00%	7.80%
Commercial Loan [Member] | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 806	$ 672
Commercial Loan [Member] | Other | Mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of Total	13.40%	12.40%

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