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Investments (Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period $ 353 $ 342
Adoption of new credit loss guidance 78 0
Initial credit losses on PCD loans 16 0
Provision (release) 115 19
Charge-offs, net of recoveries (7) (4)
Balance, end of period 555 357
Commercial Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 246 238
Adoption of new credit loss guidance (118) 0
Initial credit losses on PCD loans 0 0
Provision (release) 47 8
Charge-offs, net of recoveries 0 0
Balance, end of period 175 246
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 55 58
Adoption of new credit loss guidance 161 0
Initial credit losses on PCD loans 16 0
Provision (release) 62 9
Charge-offs, net of recoveries (5) (4)
Balance, end of period 289 63
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 52 46
Adoption of new credit loss guidance 35 0
Initial credit losses on PCD loans 0 0
Provision (release) 6 2
Charge-offs, net of recoveries (2) 0
Balance, end of period $ 91 $ 48