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, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	$ 178	$ 137
Current period provision	82	54
Charge-offs, net of recoveries	(60)	(13)
Financing receivable, allowance for credit losses, end of year	200	178
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	106	69
Current period provision	76	50
Charge-offs, net of recoveries	(48)	(13)
Financing receivable, allowance for credit losses, end of year	134	106
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	30	19
Current period provision	2	11
Charge-offs, net of recoveries	(12)	0
Financing receivable, allowance for credit losses, end of year	20	30
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	42	49
Current period provision	4	(7)
Charge-offs, net of recoveries	0	0
Financing receivable, allowance for credit losses, end of year	$ 46	$ 42