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Business and Basis of Presentation - Change in Accounting Policy (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Apr. 01, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]          
Shareholders’ equity attributable to OMH $ 3,020   $ 2,809 $ 2,061 $ 1,618
Finance receivables past due period 60 days        
Adjustments          
Financing Receivable, Impaired [Line Items]          
Shareholders’ equity attributable to OMH   $ 42 $ 58 $ 36 $ 78