Investments - Mortgages by Standing (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	$ 10,612	$ 11,549
Restructured	0	0
In the Process of Foreclosure	23	15
In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	10,533	11,471
Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	56	63
Commercial mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	9,594	10,241
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	9,594	10,241
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	3,230	3,558
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	3,230	3,558
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	882	1,015
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	882	1,015
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	1,459	1,795
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	1,459	1,795
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	2,011	2,085
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	2,011	2,085
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	2,012	1,788
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	2,012	1,788
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	1,018	1,308
Residential mortgage loans \| Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	1,018	1,308
Restructured	0	0
In the Process of Foreclosure	23	15
Residential mortgage loans \| Residential \| Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
In the Process of Foreclosure	7	12
Residential mortgage loans \| Residential \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	939	1,230
Residential mortgage loans \| Residential \| Greater than 90 Days Delinquent
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	56	63
Residential mortgage loans \| Residential \| Greater than 90 Days Delinquent \| Financial Asset Acquired with Credit Deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	26	41
Mezzanine loans \| Apartment \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	389	410
Mezzanine loans \| Hotel \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	21	41
Mezzanine loans \| Office \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	166	236
Mezzanine loans \| Retail \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	31	43
Mezzanine loans \| Warehouse \| In Good Standing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	$ 295	$ 140

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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