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Business Acquisition - Pro forma (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Net loss attributable to the Company $ (38) $ (20) $ (57) $ 46
GE Transaction Agreement        
Business Acquisition [Line Items]        
Revenue   5,417   10,741
Net loss   (184)   (193)
Net loss attributable to the Company   $ (34)   $ (31)
Business acquisition, pro forma income per Class A common stock - basic (in dollars per share)   $ (0.08)   $ (0.07)
Business acquisition, pro forma income per Class A common stock - diluted (in dollars per share)   $ (0.08)   $ (0.07)