Investments (Past Due and Interest Accrual Status of Mortgage Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 88,064	$ 89,812
Greater than 90 Days Past Due and Still Accruing Interest	469	280
Financing Receivable, Nonaccrual	2,318	1,658
Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	2,064	1,578
Commercial Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	53,455	56,310
Greater than 90 Days Past Due and Still Accruing Interest	122	0
Financing Receivable, Nonaccrual	1,743	1,123
Commercial Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	1,158	773
Residential Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	15,286	14,189
Greater than 90 Days Past Due and Still Accruing Interest	21	18
Financing Receivable, Nonaccrual	481	446
Residential Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	497	464
Agricultural Mortgage Loans
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	19,323	19,313
Greater than 90 Days Past Due and Still Accruing Interest	326	262
Financing Receivable, Nonaccrual	94	89
Agricultural Mortgage Loans | Financial Asset, Past Due
Financing Receivable, Nonaccrual [Line Items]
Mortgage Loans, Gross	$ 409	$ 341