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, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	$ 119	$ 123
Current period provision	23	19
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(5)	(23)
Financing receivable, allowance for credit losses, end of year	137	119
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	49	67
Current period provision	24	5
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(4)	(23)
Financing receivable, allowance for credit losses, end of year	69	49
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	15	12
Current period provision	5	3
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1)	0
Financing receivable, allowance for credit losses, end of year	19	15
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	55	44
Current period provision	(6)	11
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	0	0
Financing receivable, allowance for credit losses, end of year	$ 49	$ 55