Investments (Past Due and Interest Accrual Status of Mortgage Loans) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 89,812	$ 93,227
Greater than 90 Days Past Due and Still Accruing Interest	280	19
Financing Receivable, Nonaccrual	1,658	1,035
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	1,578	533
Commercial Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	56,310	60,326
Greater than 90 Days Past Due and Still Accruing Interest	0	3
Financing Receivable, Nonaccrual	1,123	427
Commercial Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	773	75
Residential Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	14,189	13,096
Greater than 90 Days Past Due and Still Accruing Interest	18	16
Financing Receivable, Nonaccrual	446	402
Residential Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	464	418
Agricultural Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	19,313	19,805
Greater than 90 Days Past Due and Still Accruing Interest	262	0
Financing Receivable, Nonaccrual	89	206
Agricultural Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 341	$ 40