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INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Refinancing of Wind Tre S.p.A (Details) - Italy Joint Venture
€ in Millions, $ in Millions
Oct. 24, 2017
EUR (€)
item
Nov. 03, 2017
EUR (€)
Nov. 03, 2017
USD ($)
Oct. 24, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]        
Number of international banks to whom we entered agreement | item 21      
Term loan        
Disclosure of detailed information about borrowings [line items]        
Facility amount € 3,000     $ 3,500
Debt instrument term 5 years      
Interest rate (as a percent) 2.00%     2.00%
Revolving credit facility        
Disclosure of detailed information about borrowings [line items]        
Facility amount € 400     $ 470
Debt instrument term 5 years      
Interest rate (as a percent) 1.75%     1.75%
Senior secured notes | Euro        
Disclosure of detailed information about borrowings [line items]        
Facility amount   € 5,600 $ 6,516  
Senior secured notes | U.S. Dollar        
Disclosure of detailed information about borrowings [line items]        
Facility amount | $     $ 2,000  
Senior Secured Floating Rate Notes due 2024        
Disclosure of detailed information about borrowings [line items]        
Facility amount   2,250    
2.625% Senior Secured Notes due 2023        
Disclosure of detailed information about borrowings [line items]        
Facility amount   € 1,625    
Interest rate (as a percent)   2.625% 2.625%  
3.125% Senior Secured Notes due 2025        
Disclosure of detailed information about borrowings [line items]        
Facility amount   € 1,750    
Interest rate (as a percent)   3.125% 3.125%  
5.0% Senior Secured Notes due 2026        
Disclosure of detailed information about borrowings [line items]        
Facility amount | $     $ 2,000  
Interest rate (as a percent)   5.00% 5.00%