Investments (Analysis of Past Due Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total	$ 57,930	$ 56,948
Non-accrual status	122	28
Current
Financing Receivable, Past Due [Line Items]
Total	57,861	56,923
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	14
90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	69	11
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	69	25
Commercial Mortgage Loans
Financing Receivable, Past Due [Line Items]
Total	50,487	49,477
Non-accrual status	72	11
Commercial Mortgage Loans | Current
Financing Receivable, Past Due [Line Items]
Total	50,418	49,465
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	0	3
Commercial Mortgage Loans | 90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	69	9
Commercial Mortgage Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	69	12
Agricultural property loans
Financing Receivable, Past Due [Line Items]
Total	6,884	6,857
Non-accrual status	25	17
Agricultural property loans | Current
Financing Receivable, Past Due [Line Items]
Total	6,884	6,844
Agricultural property loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Agricultural property loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	11
Agricultural property loans | 90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	0	2
Agricultural property loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	13
Residential property loans
Financing Receivable, Past Due [Line Items]
Total	34	43
Non-accrual status	0	0
Residential property loans | Current
Financing Receivable, Past Due [Line Items]
Total	34	43
Residential property loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential property loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential property loans | 90 days or more past due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential property loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Other collateralized loans
Financing Receivable, Past Due [Line Items]
Total	104	108
Non-accrual status	0	0
Other collateralized loans | Current
Financing Receivable, Past Due [Line Items]
Total	104	108
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	421	463
Non-accrual status	25	0
Uncollateralized loans | Current
Financing Receivable, Past Due [Line Items]
Total	421	463
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