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Leases - Supplementary Information Regarding Lease Accounting (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Operating Lease Cost:  
Operating lease cost $ 13
Other information:  
Cash paid for amounts included in the measurement of lease liabilities- Operating Cash flows 13
Right-of-use assets obtained in exchange for operating lease liabilities during the period $ 19
Weighted-average remaining lease term 18 months
Weighted-average discount rate 13.00%