Investments (Mortgage Loans - Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Contracts	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	$ (744)	$ (759)
Financing Receivable, Purchase	3,100	1,800	$ 3,300
Mortgage Loans, Gross	$ 84,290	$ 79,860
Percentage of Mortgage Loans Classified as Performing	99.00%	99.00%
Financing Receivable, Nonaccrual	$ 762	$ 822
Mortgage Loans Contributed To Joint Ventures	489
Amortized Cost Of Mortgage Loans Foreclosed	467
Gain On Mortgage Loans Foreclosure	34
Commercial Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	219	180
Mortgage Loans, Gross	52,502	50,553
Financing Receivable, Nonaccrual	169	155	317
Financing Receivable, Nonaccrual, No Allowance	$ 0	0
Financing Receivable, Modifications, Number of Contracts | Contracts	2
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 162
Financing Receivable, Troubled Debt Restructuring, Postmodification	162
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	81	86
Mortgage Loans, Gross	12,482	11,196
Financing Receivable, Nonaccrual	462	442	534
Financing Receivable, Nonaccrual, No Allowance	0	0
Agricultural Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest Receivable	176	161
Mortgage Loans, Gross	19,306	18,111
Financing Receivable, Nonaccrual	131	225	$ 266
Financing Receivable, Nonaccrual, No Allowance	$ 7	$ 134
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of mortgage loans with LTV ratio in excess of 100%	1.00%
Mortgage Loans with LTV ratio in excess of 100% [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage Loans, Gross	$ 732