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, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	$ 123
Current period provision	19	$ 27	$ 30
PCD credit allowance	0	2
Financing receivable, allowance for credit losses, end of year	119	123
Charge-offs, net of recoveries	(23)
Cumulative Effect, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year		94	64
Financing receivable, allowance for credit losses, end of year			94
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	67
Current period provision	5	23	17
PCD credit allowance		0
Financing receivable, allowance for credit losses, end of year	49	67
Charge-offs, net of recoveries	(23)
Commercial | Cumulative Effect, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year		44	27
Financing receivable, allowance for credit losses, end of year			44
Agricultural
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	12
Current period provision	3	(3)	(1)
PCD credit allowance		0
Financing receivable, allowance for credit losses, end of year	15	12
Charge-offs, net of recoveries	0
Agricultural | Cumulative Effect, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year		15	16
Financing receivable, allowance for credit losses, end of year			15
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year	44
Current period provision	11	7	14
PCD credit allowance		2
Financing receivable, allowance for credit losses, end of year	55	44
Charge-offs, net of recoveries	$ 0
Residential | Cumulative Effect, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing receivable, allowance for credit losses, beginning of year		$ 35	21
Financing receivable, allowance for credit losses, end of year			$ 35