Investments (Past Due and Interest Accrual Status of Mortgage Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 90,608	$ 93,227
Greater than 90 Days Past Due and Still Accruing Interest	70	19
Financing Receivable, Nonaccrual	1,320	1,035
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	1,261	533
Commercial Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	57,699	60,326
Greater than 90 Days Past Due and Still Accruing Interest	38	3
Financing Receivable, Nonaccrual	741	427
Commercial Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	660	75
Residential Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	13,273	13,096
Greater than 90 Days Past Due and Still Accruing Interest	17	16
Financing Receivable, Nonaccrual	390	402
Residential Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	407	418
Agricultural Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	19,636	19,805
Greater than 90 Days Past Due and Still Accruing Interest	15	0
Financing Receivable, Nonaccrual	189	206
Agricultural Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 194	$ 40