Investments (Past Due and Interest Accrual Status of Mortgage Loans) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 84,290	$ 79,860
Greater than 90 Days Past Due and Still Accruing Interest	39	37
Financing Receivable, Nonaccrual	762	822
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	603	587
Commercial Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	52,502	50,553
Greater than 90 Days Past Due and Still Accruing Interest	6	13
Financing Receivable, Nonaccrual	169	155	$ 317
Commercial Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	6	13
Residential Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	12,482	11,196
Greater than 90 Days Past Due and Still Accruing Interest	12	8
Financing Receivable, Nonaccrual	462	442	534
Residential Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	473	450
Agricultural Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	19,306	18,111
Greater than 90 Days Past Due and Still Accruing Interest	21	16
Financing Receivable, Nonaccrual	131	225	$ 266
Agricultural Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 124	$ 124