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Investments - Balances of Restricted Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments $ 79 $ 120
Florida    
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments 12 32
New Mexico    
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments 21 43
Ohio    
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments 12 12
Puerto Rico    
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments 11 10
Other    
Schedule of Held-to-maturity Securities [Line Items]    
Restricted investments $ 23 $ 23