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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Feb. 28, 2019
Dec. 31, 2018
Income Tax Contingency [Line Items]        
Tax at statutory rate, percentage 21.00% 21.00%    
Unrecognized Tax Benefits $ 34     $ 34
MSP Underwriting Limited        
Income Tax Contingency [Line Items]        
Net deferred tax assets     $ 59  
Valuation allowance     $ 55  
Operating Loss Carryforwards $ 192