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Insurance - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Claims Development [Line Items]          
Reserves related to unearned premiums, claims and benefits assumed from non-affiliated insurance companies $ 369,000,000   $ 369,000,000 $ 319,000,000  
OMH insurance subsidiaries          
Claims Development [Line Items]          
Period restricting maximum amount of dividends without prior approval     12 months    
Policyholders' surplus restricting maximum amount of dividends (as a percent) 10.00%   10.00%    
Period restricting maximum ordinary dividends without prior approval     12 months    
Policyholders' surplus restricting maximum ordinary dividends (as a percent) 10.00%   10.00%    
AHL | OMH          
Claims Development [Line Items]          
Ordinary dividends paid     $ 0 34,000,000 $ 0
Merit | SFC          
Claims Development [Line Items]          
Ordinary dividends paid       37,000,000  
Other operating expense          
Claims Development [Line Items]          
Net gain on sale of shares of former insurance subsidiary $ 9,000,000        
OMH          
Claims Development [Line Items]          
Impairment loss on transfer to held for sale   $ 14,000,000      
Non Affiliated Entity          
Claims Development [Line Items]          
Reserves related to unearned premiums, claims and benefits ceded to non-affiliated insurance companies $ 71,000,000   $ 71,000,000 $ 74,000,000