Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	$ 721	$ 527	$ 634
Provision (release) (1)	229	249	43
Charge-offs, net of recoveries	(150)	(55)	(150)
Balance at December 31,	800	721	527
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	367	218	340
Provision (release) (1)	198	168	(2)
Charge-offs, net of recoveries	(28)	(19)	(120)
Balance at December 31,	537	367	218
Allowance for Credit Loss releases related to Discounted Payoff Losses	58
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	182	190	206
Provision (release) (1)	(3)	(8)	(8)
Charge-offs, net of recoveries	0	0	(8)
Balance at December 31,	179	182	190
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	172	119	88
Provision (release) (1)	34	89	53
Charge-offs, net of recoveries	(122)	(36)	(22)
Balance at December 31,	$ 84	$ 172	$ 119