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Investments (Past Due Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses $ 22,812 $ 22,645
Current    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 22,655 22,520
30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 4 2
60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 52 30
90 to 179 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 31 23
180 Days and Greater Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 70 70
Commercial    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 13,208 13,193
Commercial | Current    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 13,191 13,176
Commercial | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 0 0
Commercial | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 0 0
Commercial | 90 to 179 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 0 0
Commercial | 180 Days and Greater Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 17 17
Agricultural    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 4,539 4,445
Agricultural | Current    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 4,502 4,429
Agricultural | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 2 0
Agricultural | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 19 0
Agricultural | 90 to 179 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 0 0
Agricultural | 180 Days and Greater Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 16 16
Residential    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 5,065 5,007
Residential | Current    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 4,962 4,915
Residential | 30 to 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 2 2
Residential | 60 to 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 33 30
Residential | 90 to 179 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses 31 23
Residential | 180 Days and Greater Past Due    
Financing Receivable, Past Due [Line Items]    
Financing receivable, before allowance for credit losses $ 37 $ 37