Investments (Rollforward of the Allowance for Credit Losses for Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	$ 137	$ 119
Current period provision	54	23
Charge-offs, net of recoveries	(13)	(5)
Financing receivable, allowance for credit losses, end of year	178	137
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	69	49
Current period provision	50	24
Charge-offs, net of recoveries	(13)	(4)
Financing receivable, allowance for credit losses, end of year	106	69
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	19	15
Current period provision	11	5
Charge-offs, net of recoveries	0	(1)
Financing receivable, allowance for credit losses, end of year	30	19
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	49	55
Current period provision	(7)	(6)
Charge-offs, net of recoveries	0	0
Financing receivable, allowance for credit losses, end of year	$ 42	$ 49