v3.19.3.a.u2
Assets and Liabilities Held for Sale - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment loss   $ 197 $ 57
Lion City Rentals | Not Discontinued Operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Equity percentage to be purchased 100.00%    
Fair value of consideration received, cash $ 310    
Contingent consideration $ 33