Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 527	$ 634
Provision (release)	172	(18)
Charge-offs, net of recoveries	(7)	(1)
Balance, end of period	692	615
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	218	340
Provision (release)	101	(12)
Charge-offs, net of recoveries	0	0
Balance, end of period	319	328
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	190	206
Provision (release)	22	(21)
Charge-offs, net of recoveries	0	(1)
Balance, end of period	212	184
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	119	88
Provision (release)	49	15
Charge-offs, net of recoveries	(7)	0
Balance, end of period	$ 161	$ 103