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Investments (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Gain (Loss) on Securities [Line Items]          
Reduction of net unrealized gains on investments included in AOCI due to shadow adjustments $ 2,342,000,000   $ 2,342,000,000   $ 2,198,000,000
Notional value 197,000,000   197,000,000   182,000,000
Derivative liability, fair value, gross liability (12,000,000)   (12,000,000)   (7,000,000)
Commitments to purchase or fund privately placed debt securities 1,205,000,000   1,205,000,000    
Commitments to sell various privately placed debt securities 50,000,000   50,000,000    
Debt securities, amortized cost 38,392,000,000   38,392,000,000   $ 38,126,000,000
Common Stock          
Gain (Loss) on Securities [Line Items]          
Equity securities, FV-NI, gain (loss) 23,000,000 $ 4,000,000 10,000,000 $ 21,000,000  
Preferred stock          
Gain (Loss) on Securities [Line Items]          
Equity securities, FV-NI, gain (loss) 63,000,000 11,000,000 (70,000,000) 53,000,000  
Fixed maturity securities          
Gain (Loss) on Securities [Line Items]          
Interest receivable 373,000,000   373,000,000    
Mortgage loans          
Gain (Loss) on Securities [Line Items]          
Interest receivable 4,000,000   4,000,000    
Debt securities, amortized cost $ 22,000,000   22,000,000    
Financing receivable, allowance for credit loss, writeoff     $ 0    
Senior Notes | 5.875%, face amount of $500, due August 15, 2020          
Gain (Loss) on Securities [Line Items]          
Realized investment gains (losses)   21,000,000   21,000,000  
Face amount   $ 500,000,000   $ 500,000,000