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Investments - Troubled Debt Restructuring (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0
Commercial mortgage loans    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts 0 0
Private placement debt    
Financing Receivable, Modifications [Line Items]    
Financing Receivable, Modifications, Number of Contracts   1
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $   $ 3
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ $ 0