Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 527	$ 634
Provision (release)	210	(6)
Charge-offs, net of recoveries	(13)	(142)
Balance, end of period	724	486
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	218	340
Provision (release)	148	(16)
Charge-offs, net of recoveries	0	(119)
Balance, end of period	366	205
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	190	206
Provision (release)	13	(31)
Charge-offs, net of recoveries	0	(1)
Balance, end of period	203	174
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	119	88
Provision (release)	49	41
Charge-offs, net of recoveries	(13)	(22)
Balance, end of period	$ 155	$ 107