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Discontinued Operations (Details)
£ in Millions, $ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Oct. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
entity
Jan. 10, 2018
USD ($)
Jan. 10, 2018
GBP (£)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Tax payment related to income recognized in 2017 from a prior disposition $ 7        
Number of entities to dispose | entity     2    
Discontinued Operations, Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration from sale of business       $ 50 £ 37
Discontinued Operations, Held-for-sale or Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of entities to dispose | entity     2    
Assets held for sale     $ 148    
Liabilities held for sale     $ 25    
Subsequent Event | Discontinued Operations, Held-for-sale or Disposed of by Sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration from sale of business   $ 133