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Investments - Troubled Debt Restructuring (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Financing Receivable, Modifications [Line Items]    
Securities received as collateral | $ $ 106 $ 67
Private placement debt    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans, number 1 0
Financing Receivable, Modifications, Pre-Modification Recorded Investment | $ $ 74  
Post-modification carrying value | $ $ 57  
Troubled debt restructured loans, subsequent payment default, number 0 0
Commercial mortgage    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructured loans, number 0 0
Troubled debt restructured loans, subsequent payment default, number 0 0