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Contingent Liabilities - Additional Information (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]      
Estimated cost accrued   $ 6  
Other current assets $ 23    
Guarantee obligations 13   $ 13
Indemnification Asset      
Loss Contingencies [Line Items]      
Other current assets $ 23