Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	$ 634	$ 590	$ 353
Adoption of credit loss guidance	0	0	78
Provision (release)	43	67	176
Initial credit losses on PCD loans (1)	0	3	18
Charge-offs, net of recoveries	(150)	(26)	(34)
HFS transfer	0	0	(1)
Balance at December 31,	527	634	590
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	340	252	246
Adoption of credit loss guidance	0	0	(118)
Provision (release)	(2)	88	124
Initial credit losses on PCD loans (1)	0	0	0
Charge-offs, net of recoveries	(120)	0	0
HFS transfer	0	0	0
Balance at December 31,	218	340	252
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	206	232	55
Adoption of credit loss guidance	0	0	161
Provision (release)	(8)	(27)	30
Initial credit losses on PCD loans (1)	0	3	18
Charge-offs, net of recoveries	(8)	(2)	(32)
HFS transfer	0	0	0
Balance at December 31,	190	206	232
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1,	88	106	52
Adoption of credit loss guidance	0	0	35
Provision (release)	53	6	22
Initial credit losses on PCD loans (1)	0	0	0
Charge-offs, net of recoveries	(22)	(24)	(2)
HFS transfer	0	0	(1)
Balance at December 31,	$ 119	$ 88	$ 106