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Acquisitions (Details)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
acquisition
Dec. 31, 2020
GBP (£)
acquisition
Dec. 31, 2020
CAD ($)
acquisition
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Business Acquisitions, by Acquisition [Line Items]          
Acquisition $ 194,000,000        
Payments to acquire business $ 203,000,000     $ 42,000,000 $ 0
U.K. Acquisitions          
Schedule of Business Acquisitions, by Acquisition [Line Items]          
Number of businesses acquired | acquisition 3 3 3    
Acquisition $ 172,000,000 £ 133      
Digitex Canada          
Schedule of Business Acquisitions, by Acquisition [Line Items]          
Acquisition 22,000,000   $ 29    
2020 Acquisitions          
Schedule of Business Acquisitions, by Acquisition [Line Items]          
Acquisition $ 9,000,000        
Percentage of business acquired 100.00% 100.00% 100.00%    
Amount expected to be deductible for tax purposes $ 0        
Revenue of acquiree since date of acquisition 99,000,000        
ROA and HBS          
Schedule of Business Acquisitions, by Acquisition [Line Items]          
Payments to acquire business       38,000,000  
2019 Acquisitions          
Schedule of Business Acquisitions, by Acquisition [Line Items]          
Acquisition       4,000,000  
Revenue of acquiree since date of acquisition 21,000,000     $ 18,000,000  
2018 Acquisitions          
Schedule of Business Acquisitions, by Acquisition [Line Items]          
Payments to acquire business         $ 0
HP Inc. | Bridge Loan          
Schedule of Business Acquisitions, by Acquisition [Line Items]          
Amount committed by lender $ 24,000,000,000