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Capital Stock and Earnings Per Share (OMH Only) - Additional Information (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
class
$ / shares
shares
Mar. 31, 2019
USD ($)
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Number of classes of authorized stock | class 2  
Stock repurchase program $ 200,000,000  
Shares repurchased and retired (in shares) | shares 2,031,698  
Shares repurchased average price per share (in usd per share) | $ / shares $ 22.30  
Stock Repurchased and Retired During Period, Value $ 45,000,000  
Payments of dividends 387,000,000 $ 34,000,000
SFC    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Payments of dividends $ 45,000,000