Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	$ 800	$ 721
Provision (release)	181	93
Charge-offs, net of recoveries	0	0
Balance, end of period	981	814
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	537	367
Provision (release)	160	94
Charge-offs, net of recoveries	0	0
Balance, end of period	697	461
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	179	182
Provision (release)	10	(17)
Charge-offs, net of recoveries	0	0
Balance, end of period	189	165
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, beginning of period	84	172
Provision (release)	11	16
Charge-offs, net of recoveries	0	0
Balance, end of period	$ 95	$ 188