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Financial Instruments - Summary of Aggregate Contracted Principal Amounts of Company's Derivative Contracts Outstanding (Detail)
₺ in Millions, € in Millions, ر.ق in Millions, ر.ع. in Millions, ر.س in Millions, د.إ in Millions, ¥ in Millions, £ in Millions, zł in Millions, kr in Millions, kr in Millions, SFr in Millions, R in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions
Mar. 31, 2018
EUR (€)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
SGD ($)
Mar. 31, 2018
AUD ($)
Mar. 31, 2018
GBP (£)
Mar. 31, 2018
SAR (ر.س)
Mar. 31, 2018
AED (د.إ)
Mar. 31, 2018
ZAR (R)
Mar. 31, 2018
CAD ($)
Mar. 31, 2018
PLN (zł)
Mar. 31, 2018
DKK (kr)
Mar. 31, 2018
JPY (¥)
Mar. 31, 2018
MXN ($)
Mar. 31, 2018
NOK (kr)
Mar. 31, 2018
TRY (₺)
Mar. 31, 2018
CHF (SFr)
Mar. 31, 2018
OMR (ر.ع.)
Mar. 31, 2018
QAR (ر.ق)
Mar. 31, 2017
EUR (€)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
SGD ($)
Mar. 31, 2017
AUD ($)
Mar. 31, 2017
GBP (£)
Mar. 31, 2017
SAR (ر.س)
Mar. 31, 2017
AED (د.إ)
Mar. 31, 2017
ZAR (R)
Mar. 31, 2017
CAD ($)
Mar. 31, 2017
PLN (zł)
At cost [member] | Sell: Forward contracts [member] | U.S.Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments   $ 904                                   $ 886                
Non-designated derivative instruments   939                                   889                
At cost [member] | Sell: Forward contracts [member] | EURO [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments | € € 134                                   € 228                  
Non-designated derivative instruments | € 58                                   83                  
At cost [member] | Sell: Forward contracts [member] | Great British Pound [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments | £         £ 147                                   £ 280          
Non-designated derivative instruments | £         95                                   82          
At cost [member] | Sell: Forward contracts [member] | Australian Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments       $ 77                                   $ 129            
Non-designated derivative instruments       77                                   51            
At cost [member] | Sell: Forward contracts [member] | Singapore, Dollars [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments     $ 6                                   $ 3              
At cost [member] | Sell: Forward contracts [member] | South Africa, Rand [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | R               R 132                                   R 262    
At cost [member] | Sell: Forward contracts [member] | Canadian Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments                 $ 14                                   $ 41  
At cost [member] | Sell: Forward contracts [member] | Saudi Arabian Riyal [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ر.س           ر.س 62                                   ر.س 49        
At cost [member] | Sell: Forward contracts [member] | United Arab Emirates, Dirhams [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | د.إ             د.إ 8                                   د.إ 69      
At cost [member] | Sell: Forward contracts [member] | Poland, Zlotych [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | zł                   zł 36                                   zł 31
At cost [member] | Sell: Forward contracts [member] | Switzerland, Francs [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | SFr                               SFr 6                        
At cost [member] | Sell: Forward contracts [member] | Qatar, Rials                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ر.ق                                   ر.ق 11                    
At cost [member] | Sell: Forward contracts [member] | Turkey, New Lira                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ₺                             ₺ 10                          
At cost [member] | Sell: Forward contracts [member] | Mexico, Pesos                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments                         $ 61                              
At cost [member] | Sell: Forward contracts [member] | Norway, Krone                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | kr                           kr 34                            
At cost [member] | Sell: Forward contracts [member] | Oman, Rials                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ر.ع.                                 ر.ع. 3                      
At cost [member] | Range forward option contracts [member] | U.S.Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments   182                                   130                
Non-designated derivative instruments   50                                                    
At cost [member] | Range forward option contracts [member] | EURO [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments | £         13                                              
Non-designated derivative instruments | £         20                                              
At cost [member] | Range forward option contracts [member] | Great British Pound [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments | € 10                                                      
At cost [member] | Interest rate swaps [member] | U.S.Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments   75                                                    
At cost [member] | Buy l forward contract [member] | U.S.Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments   575                                   750                
At cost [member] | Buy l forward contract [member] | Japan, Yen [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ¥                       ¥ 399                                
At cost [member] | Buy l forward contract [member] | Denmark, Kroner                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | kr                     kr 9                                  
At fair value [member] | Sell: Forward contracts [member] | U.S.Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments   951                                   3,627                
Non-designated derivative instruments   (360)                                   1,714                
At fair value [member] | Sell: Forward contracts [member] | EURO [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments | € (531)                                   1,166                  
Non-designated derivative instruments | € 6                                   € (4)                  
At fair value [member] | Sell: Forward contracts [member] | Great British Pound [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments | £         (667)                                   2,475          
Non-designated derivative instruments | £         (56)                                   £ 79          
At fair value [member] | Sell: Forward contracts [member] | Australian Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments       29                                   154            
Non-designated derivative instruments       $ 68                                   $ 3            
At fair value [member] | Sell: Forward contracts [member] | Singapore, Dollars [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments     $ (1)                                   $ (3)              
At fair value [member] | Sell: Forward contracts [member] | South Africa, Rand [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | R               R (16)                                   R (17)    
At fair value [member] | Sell: Forward contracts [member] | Canadian Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments                 $ 32                                   $ 22  
At fair value [member] | Sell: Forward contracts [member] | Saudi Arabian Riyal [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ر.س                                               ر.س 11        
At fair value [member] | Sell: Forward contracts [member] | Poland, Zlotych [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | zł                   zł 12                                    
At fair value [member] | Sell: Forward contracts [member] | Switzerland, Francs [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | SFr                               SFr 3                        
At fair value [member] | Sell: Forward contracts [member] | Qatar, Rials                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ر.ق                                   ر.ق (3)                    
At fair value [member] | Sell: Forward contracts [member] | Turkey, New Lira                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ₺                             ₺ 8                          
At fair value [member] | Sell: Forward contracts [member] | Mexico, Pesos                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments                         $ (6)                              
At fair value [member] | Sell: Forward contracts [member] | Norway, Krone                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | kr                           kr 3                            
At fair value [member] | Sell: Forward contracts [member] | Oman, Rials                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ر.ع.                                 ر.ع. (1)                      
At fair value [member] | Range forward option contracts [member] | U.S.Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments   5                                   106                
Non-designated derivative instruments   (6)                                                    
At fair value [member] | Range forward option contracts [member] | EURO [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments | £         5                                              
Non-designated derivative instruments | £         £ (2)                                              
At fair value [member] | Range forward option contracts [member] | Great British Pound [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments | € € 2                                                      
At fair value [member] | Interest rate swaps [member] | U.S.Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Designated derivative instruments   (7)                                                    
At fair value [member] | Buy l forward contract [member] | U.S.Dollar [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments   $ (417)                                   $ (2,616)                
At fair value [member] | Buy l forward contract [member] | Japan, Yen [member]                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | ¥                       ¥ 6                                
At fair value [member] | Buy l forward contract [member] | Denmark, Kroner                                                        
Disclosure of derivative contract outstanding [line items]                                                        
Non-designated derivative instruments | kr                     kr (1)