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Investments - Mortgage Loans, Net by Property Type and Geographic Region (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans				$ 24,148
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			$ 20,108	16,897
Commercial Real Estate Portfolio Segment [Member] | Property Type Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	100.00%	100.00%
Commercial Real Estate Portfolio Segment [Member] | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	100.00%	100.00%
Commercial Real Estate Portfolio Segment [Member] | Total US region
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			16,860	14,796
Commercial Real Estate Portfolio Segment [Member] | Total US region | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	83.90%	87.50%
Commercial Real Estate Portfolio Segment [Member] | East North Central
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			1,437	1,697
Commercial Real Estate Portfolio Segment [Member] | East North Central | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	7.10%	10.00%
Commercial Real Estate Portfolio Segment [Member] | East South Central
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			413	470
Commercial Real Estate Portfolio Segment [Member] | East South Central | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	2.10%	2.80%
Commercial Real Estate Portfolio Segment [Member] | Middle Atlantic
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			5,183	3,637
Commercial Real Estate Portfolio Segment [Member] | Middle Atlantic | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	25.80%	21.50%
Commercial Real Estate Portfolio Segment [Member] | Mountain
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			898	460
Commercial Real Estate Portfolio Segment [Member] | Mountain | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	4.50%	2.70%
Commercial Real Estate Portfolio Segment [Member] | New England
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			1,076	453
Commercial Real Estate Portfolio Segment [Member] | New England | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	5.40%	2.70%
Commercial Real Estate Portfolio Segment [Member] | Pacific
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			3,781	3,994
Commercial Real Estate Portfolio Segment [Member] | Pacific | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	18.80%	23.60%
Commercial Real Estate Portfolio Segment [Member] | South Atlantic
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			2,756	2,817
Commercial Real Estate Portfolio Segment [Member] | South Atlantic | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	13.70%	16.70%
Commercial Real Estate Portfolio Segment [Member] | West North Central
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			231	271
Commercial Real Estate Portfolio Segment [Member] | West North Central | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	1.10%	1.60%
Commercial Real Estate Portfolio Segment [Member] | West South Central
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			1,085	997
Commercial Real Estate Portfolio Segment [Member] | West South Central | Geographic Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	5.40%	5.90%
Commercial Real Estate Portfolio Segment [Member] | Office building
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			4,651	4,870
Commercial Real Estate Portfolio Segment [Member] | Office building | Property Type Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	23.10%	28.80%
Commercial Real Estate Portfolio Segment [Member] | Retail
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			1,454	2,022
Commercial Real Estate Portfolio Segment [Member] | Retail | Property Type Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	7.20%	12.00%
Commercial Real Estate Portfolio Segment [Member] | Apartment
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			6,692	4,626
Commercial Real Estate Portfolio Segment [Member] | Apartment | Property Type Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	33.30%	27.40%
Commercial Real Estate Portfolio Segment [Member] | Hotels
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			1,855	1,727
Commercial Real Estate Portfolio Segment [Member] | Hotels | Property Type Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	9.20%	10.20%
Commercial Real Estate Portfolio Segment [Member] | Industrial
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			2,047	2,336
Commercial Real Estate Portfolio Segment [Member] | Industrial | Property Type Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	10.20%	13.80%
Commercial Real Estate Portfolio Segment [Member] | Other commercial
Loans and Leases Receivable Disclosure [Line Items]
Mortgage loans			$ 3,409	$ 1,316
Commercial Real Estate Portfolio Segment [Member] | Other commercial | Property Type Concentration Risk | Mortgage Loans, Net
Loans and Leases Receivable Disclosure [Line Items]
Percentage of Total	17.00%	7.80%

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- Definition

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