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Subsequent Events (Details)
£ in Millions, CAD in Millions, AUD in Millions, $ in Millions
3 Months Ended
May 01, 2017
USD ($)
Apr. 26, 2017
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Apr. 18, 2017
AUD
Apr. 18, 2017
GBP (£)
Apr. 18, 2017
CAD
Apr. 18, 2017
USD ($)
Subsequent Event [Line Items]                
Amount to be provided through debt refinanced     $ 1,300 $ 896        
Loss on debt extinguishment     $ 56 $ 46        
Secured debt | U.S. dollar-denominated senior secured term loan due March 2021 | Base Rate                
Subsequent Event [Line Items]                
Basis spread on variable rate (as a percent)     2.00%          
Subsequent Event | Acculynk | Global Business Solutions                
Subsequent Event [Line Items]                
Purchase price $ 85              
Subsequent Event | Secured debt | U.S. dollar-denominated senior secured term loan due April 2024                
Subsequent Event [Line Items]                
Amount to be provided through debt refinanced   $ 4,200            
Subsequent Event | Secured debt | U.S. dollar-denominated senior secured term loan due April 2024 | LIBOR                
Subsequent Event [Line Items]                
Basis spread on variable rate (as a percent)   2.50%            
Subsequent Event | Secured debt | U.S. dollar-denominated senior secured term loan due April 2024 | Base Rate                
Subsequent Event [Line Items]                
Basis spread on variable rate (as a percent)   1.50%            
Subsequent Event | Secured debt | U.S. dollar-denominated senior secured term loan due March 2021                
Subsequent Event [Line Items]                
Amount of debt refinanced   $ 4,200            
Loss on debt extinguishment   6            
Debt issuance costs expensed   $ 5            
Subsequent Event | Derivatives designated as hedges | Foreign exchange contracts                
Subsequent Event [Line Items]                
Maturity of foreign exchange contracts, notional value         AUD 111 £ 150 CAD 35  
Maturity of foreign exchange contracts, net settlement value               $ 90