Investments (Past Due and Interest Accrual Status of Mortgage Loans) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 91,262	$ 93,227
Greater than 90 Days Past Due and Still Accruing Interest	278	19
Financing Receivable, Nonaccrual	1,602	1,035
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	1,504	533
Commercial Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	57,949	60,326
Greater than 90 Days Past Due and Still Accruing Interest	16	3
Financing Receivable, Nonaccrual	1,072	427
Commercial Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	724	75
Residential Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	13,844	13,096
Greater than 90 Days Past Due and Still Accruing Interest	24	16
Financing Receivable, Nonaccrual	412	402
Residential Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	434	418
Agricultural Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	19,469	19,805
Greater than 90 Days Past Due and Still Accruing Interest	238	0
Financing Receivable, Nonaccrual	118	206
Agricultural Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 346	$ 40