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REDEEMABLE NONCONTROLLING INTERESTS -Narrative (Details)
$ / shares in Units, $ in Millions, ₨ in Billions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2021
USD ($)
$ / shares
Feb. 28, 2021
INR (₨)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
INR (₨)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
INR (₨)
Dec. 31, 2018
USD ($)
Apr. 21, 2016
Redeemable Noncontrolling Interest [Line Items]                  
Consideration paid for redemption       $ 861.7   $ 425.7   $ 0.0  
Long-term debt, fair value       31,400.0          
Tata Teleservices                  
Redeemable Noncontrolling Interest [Line Items]                  
Consideration paid for redemption       $ 337.3 ₨ 24.8 $ 425.7 ₨ 29.4    
ATC, TIPL                  
Redeemable Noncontrolling Interest [Line Items]                  
Controlling interest percentage       92.00%   79.00% 79.00% 63.00%  
Noncontrolling owners, ownership percentage       8.00%   21.00% 21.00% 37.00%  
ATC, TIPL | Subsequent Event | Scenario, Forecast                  
Redeemable Noncontrolling Interest [Line Items]                  
Controlling interest percentage 100.00%                
ATC, TIPL | Tata Teleservices                  
Redeemable Noncontrolling Interest [Line Items]                  
Percentage of ownership       100.00% 100.00% 50.00% 50.00%    
ATC, TIPL | IDFC                  
Redeemable Noncontrolling Interest [Line Items]                  
Percentage of ownership           100.00% 100.00%    
ATC, TIPL | Macquarie | Subsequent Event | Scenario, Forecast                  
Redeemable Noncontrolling Interest [Line Items]                  
Percentage of ownership 100.00% 100.00%              
Consideration paid for redemption $ 176.6 ₨ 12.9              
Temporary equity redemption price per share (in INR per share) | $ / shares $ 175                
Ghana And Uganda Subsidiaries                  
Redeemable Noncontrolling Interest [Line Items]                  
Consideration paid for redemption       $ 524.4          
Controlling interest percentage       100.00%   51.00% 51.00%    
Consideration adjustment     $ 1.4            
Eure-et-Loir                  
Redeemable Noncontrolling Interest [Line Items]                  
Controlling interest percentage       51.00%          
Noncontrolling owners, ownership percentage       49.00%          
Carrying value       $ 2.6          
India Transaction                  
Redeemable Noncontrolling Interest [Line Items]                  
Percentage of voting interest acquired                 51.00%