Investments - Rollforward of Mortgages Allowance for Credit Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance	$ 94	$ 179
Charge offs, net of recoveries	0	0
Provision (release)	(10)	(65)
Balance	84	114
Financing receivables, accrued interest receivable	44	35
Apartment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance	19	58
Charge offs, net of recoveries	0	0
Provision (release)	2	(31)
Balance	21	27
Hotel
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance	9	34
Charge offs, net of recoveries	0	0
Provision (release)	0	(12)
Balance	9	22
Office
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance	28	25
Charge offs, net of recoveries	0	0
Provision (release)	(6)	(9)
Balance	22	16
Retail
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance	17	24
Charge offs, net of recoveries	0	0
Provision (release)	(3)	(9)
Balance	14	15
Warehouse
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance	12	24
Charge offs, net of recoveries	0	0
Provision (release)	0	(10)
Balance	12	14
Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance	9	14
Charge offs, net of recoveries	0	0
Provision (release)	(3)	6
Balance	$ 6	$ 20