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, 2024	Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	$ 137	$ 119
Current period provision	26	27
Charge-offs, net of recoveries	(8)	(1)
Financing receivable, allowance for credit losses, end of period	155	145
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	69	49
Current period provision	38	26
Charge-offs, net of recoveries	(8)	0
Financing receivable, allowance for credit losses, end of period	99	75
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	19	15
Current period provision	(1)	0
Charge-offs, net of recoveries	0	(1)
Financing receivable, allowance for credit losses, end of period	18	14
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of period	49	55
Current period provision	(11)	1
Charge-offs, net of recoveries	0	0
Financing receivable, allowance for credit losses, end of period	$ 38	$ 56