Investments (Analysis of Past Due Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Total	$ 66,490	$ 65,184
Non-accrual status	1,047	1,090
Current
Financing Receivable, Past Due [Line Items]
Total	65,441	64,196
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	10
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	97	0
90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	952	978
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	1,049	988
Commercial Mortgage Loans
Financing Receivable, Past Due [Line Items]
Total	54,365	54,503
Non-accrual status	289	190
Commercial Mortgage Loans \| Current
Financing Receivable, Past Due [Line Items]
Total	54,064	54,349
Commercial Mortgage Loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Mortgage Loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	48	0
Commercial Mortgage Loans \| 90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	253	154
Commercial Mortgage Loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	301	154
Agricultural property loans
Financing Receivable, Past Due [Line Items]
Total	8,130	8,275
Non-accrual status	718	875
Agricultural property loans \| Current
Financing Receivable, Past Due [Line Items]
Total	7,446	7,443
Agricultural property loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	8
Agricultural property loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Agricultural property loans \| 90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	684	824
Agricultural property loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	684	832
Residential Mortgage Loans
Financing Receivable, Past Due [Line Items]
Total	3,106	1,632
Non-accrual status	15	0
Residential Mortgage Loans \| Current
Financing Receivable, Past Due [Line Items]
Total	3,042	1,630
Residential Mortgage Loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	2
Residential Mortgage Loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	49	0
Residential Mortgage Loans \| 90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	15	0
Residential Mortgage Loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	64	2
Other collateralized loans
Financing Receivable, Past Due [Line Items]
Total	727	603
Non-accrual status	0	0
Other collateralized loans \| Current
Financing Receivable, Past Due [Line Items]
Total	727	603
Other collateralized loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Other collateralized loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Other collateralized loans \| 90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	0	0
Other collateralized loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Uncollateralized loans
Financing Receivable, Past Due [Line Items]
Total	162	171
Non-accrual status	25	25
Uncollateralized loans \| Current
Financing Receivable, Past Due [Line Items]
Total	162	171
Uncollateralized loans \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Uncollateralized loans \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Uncollateralized loans \| 90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	0	0
Uncollateralized loans \| Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Loans \| 90 days or more past due
Financing Receivable, Past Due [Line Items]
Accruing interest	$ 0	$ 0