Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 721	$ 527
Provision (release)	93	172
Charge-offs, net of recoveries	0	(7)
Balance, end of period	814	692
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	367	218
Provision (release)	94	101
Charge-offs, net of recoveries	0	0
Balance, end of period	461	319
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	182	190
Provision (release)	(17)	22
Charge-offs, net of recoveries	0	0
Balance, end of period	165	212
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	172	119
Provision (release)	16	49
Charge-offs, net of recoveries	0	(7)
Balance, end of period	$ 188	$ 161