Investments (Rollforward of the Allowance for Credit Losses for Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	$ 119	$ 123
Current period provision	27	3
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1)	(23)
Financing receivable, allowance for credit losses, end of period	145	103
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	49	67
Current period provision	26	0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	0	(23)
Financing receivable, allowance for credit losses, end of period	75	44
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	15	12
Current period provision	0	3
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	(1)	0
Financing receivable, allowance for credit losses, end of period	14	15
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	55	44
Current period provision	1	0
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery	0	0
Financing receivable, allowance for credit losses, end of period	$ 56	$ 44