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Commitments and Contingencies - Narrative (Details)
$ in Millions
3 Months Ended
Aug. 17, 2020
shares
Sep. 30, 2020
USD ($)
lawsuit
Dec. 31, 2019
USD ($)
Other Commitments [Line Items]      
Estimated litigation liability | $   $ 16 $ 22
Matter of FGL Holdings      
Other Commitments [Line Items]      
Number of lawsuits filed | lawsuit   2  
Number of shares in which statutory appraisal rights have been claimed (in shares) | shares 12,000,000