Investments (Past Due and Interest Accrual Status of Mortgage Loans) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 88,889	$ 89,812
Greater than 90 Days Past Due and Still Accruing Interest	363	280
Financing Receivable, Nonaccrual	1,976	1,658
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	1,805	1,578
Commercial Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	55,018	56,310
Greater than 90 Days Past Due and Still Accruing Interest	97	0
Financing Receivable, Nonaccrual	1,399	1,123
Commercial Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	972	773
Residential Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	14,783	14,189
Greater than 90 Days Past Due and Still Accruing Interest	18	18
Financing Receivable, Nonaccrual	482	446
Residential Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	500	464
Agricultural Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	19,088	19,313
Greater than 90 Days Past Due and Still Accruing Interest	248	262
Financing Receivable, Nonaccrual	95	89
Agricultural Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 333	$ 341