Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	$ 527	$ 634	$ 590
Provision (release)	249	43	67
Initial credit losses on PCD loans (1)	0	3
Charge-offs, net of recoveries	(55)	(150)	(26)
Balance at December 31,	721	527	634
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	218	340	252
Provision (release)	168	(2)	88
Initial credit losses on PCD loans (1)	0	0
Charge-offs, net of recoveries	(19)	(120)	0
Balance at December 31,	367	218	340
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	190	206	232
Provision (release)	(8)	(8)	(27)
Initial credit losses on PCD loans (1)	0	3
Charge-offs, net of recoveries	0	(8)	(2)
Balance at December 31,	182	190	206
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	119	88	106
Provision (release)	89	53	6
Initial credit losses on PCD loans (1)	0	0
Charge-offs, net of recoveries	(36)	(22)	(24)
Balance at December 31,	$ 172	$ 119	$ 88