Investments - Mortgages by Standing (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	$ 11,620	$ 11,482
Restructured	0	0
In the Process of Foreclosure	19	6
In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	11,478	11,270
Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	123	206
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	10,581	10,543
Restructured	0	0
In the Process of Foreclosure	0	0
Commercial mortgage loans \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	10,581	10,543
Commercial mortgage loans \| Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	0	0
Commercial mortgage loans \| Apartment
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	3,875	3,755
Restructured	0	0
In the Process of Foreclosure	0	0
Commercial mortgage loans \| Apartment \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	3,875	3,755
Commercial mortgage loans \| Apartment \| Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	0	0
Commercial mortgage loans \| Hotel
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	1,049	1,054
Restructured	0	0
In the Process of Foreclosure	0	0
Commercial mortgage loans \| Hotel \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	1,049	1,054
Commercial mortgage loans \| Hotel \| Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	0	0
Commercial mortgage loans \| Office
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	1,891	1,889
Restructured	0	0
In the Process of Foreclosure	0	0
Commercial mortgage loans \| Office \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	1,891	1,889
Commercial mortgage loans \| Office \| Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	0	0
Commercial mortgage loans \| Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	2,049	2,104
Restructured	0	0
In the Process of Foreclosure	0	0
Commercial mortgage loans \| Retail \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	2,049	2,104
Commercial mortgage loans \| Retail \| Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	0	0
Commercial mortgage loans \| Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	1,717	1,741
Restructured	0	0
In the Process of Foreclosure	0	0
Commercial mortgage loans \| Warehouse \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	1,717	1,741
Commercial mortgage loans \| Warehouse \| Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	0	0
Residential mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	1,039	939
Residential mortgage loans \| Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	1,039	939
Restructured	0	0
In the Process of Foreclosure	19	6
Residential mortgage loans \| Residential \| Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
In the Process of Foreclosure	17	5
Residential mortgage loans \| Residential \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	897	727
Residential mortgage loans \| Residential \| Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	123	206
Residential mortgage loans \| Residential \| Greater than 90 Days Delinquent \| Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	119	202
Mezzanine loans \| Apartment \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	343	278
Mezzanine loans \| Hotel \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	76	75
Mezzanine loans \| Office \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	254	252
Mezzanine loans \| Retail \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	26	27
Mezzanine loans \| Warehouse \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	$ 36	$ 26

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Section 50
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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