v3.10.0.1
Fair Value Measurement of Assets and Liabilities - Assets Measured Valued Using Unobservable Inputs (Details) - Recurring - Significant Unobservable Inputs (Level 3) - Warrant
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 0
Recognition of warrant 44
Change in fair value 232
Ending balance $ 276