Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 527	$ 634
Provision (release)	201	(23)
Charge-offs, net of recoveries	(23)	(144)
Balance, end of period	705	467
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	218	340
Provision (release)	147	(11)
Charge-offs, net of recoveries	(10)	(120)
Balance, end of period	355	209
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	190	206
Provision (release)	2	(64)
Charge-offs, net of recoveries	0	(2)
Balance, end of period	192	140
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	119	88
Provision (release)	52	52
Charge-offs, net of recoveries	(13)	(22)
Balance, end of period	$ 158	$ 118