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Discontinued Operations (Details)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 31, 2019
USD ($)
entity
Jul. 29, 2019
entity
Jan. 10, 2018
USD ($)
Jan. 10, 2018
GBP (£)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of entities sold         2    
Net cash used in operating activities | $ $ 0 $ 0 $ (7)        
Discontinued Operations, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of entities sold       2 2    
Consideration from sale of business       $ 133   $ 50 £ 37