Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 721	$ 527
Provision (release)	120	210
Charge-offs, net of recoveries	(35)	(13)
Balance, end of period	806	724
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	367	218
Provision (release)	155	148
Charge-offs, net of recoveries	(28)	0
Balance, end of period	494	366
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	182	190
Provision (release)	(41)	13
Charge-offs, net of recoveries	0	0
Balance, end of period	141	203
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	172	119
Provision (release)	6	49
Charge-offs, net of recoveries	(7)	(13)
Balance, end of period	$ 171	$ 155