Investments (Rollforward of the Allowance for Credit Losses for Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	$ 178	$ 137
Current period provision	43	5
Charge-offs, net of recoveries	(12)
Financing receivable, allowance for credit losses, end of period	209	142
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	106	69
Current period provision	40	9
Charge-offs, net of recoveries	0
Financing receivable, allowance for credit losses, end of period	146	78
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	30	19
Current period provision	4	0
Charge-offs, net of recoveries	(12)
Financing receivable, allowance for credit losses, end of period	22	19
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	42	49
Current period provision	(1)	(4)
Charge-offs, net of recoveries	0
Financing receivable, allowance for credit losses, end of period	$ 41	$ 45