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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Derivative Instruments Fair Value Through Profit or Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount $ 8,829 $ 8,904
Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 2,433 2,258
Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 6,396 6,645
Less than 1 year | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 913  
Less than 1 year | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,887  
1 to 5 years | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,291  
1 to 5 years | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 2,632  
Thereafter | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 229  
Thereafter | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,877  
Foreign exchange contracts    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 3,816 4,488
Foreign exchange contracts | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,447 1,351
Foreign exchange contracts | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 2,369 3,136
Foreign exchange contracts | Less than 1 year | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 640  
Foreign exchange contracts | Less than 1 year | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,788  
Foreign exchange contracts | 1 to 5 years | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 807  
Foreign exchange contracts | 1 to 5 years | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 581  
Foreign exchange contracts | Thereafter | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 0  
Foreign exchange contracts | Thereafter | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 0  
Interest rate and cross currency interest rate swaps    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 4,843 4,261
Interest rate and cross currency interest rate swaps | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 816 752
Interest rate and cross currency interest rate swaps | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 4,027 3,509
Interest rate and cross currency interest rate swaps | Less than 1 year | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 273  
Interest rate and cross currency interest rate swaps | Less than 1 year | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 99  
Interest rate and cross currency interest rate swaps | 1 to 5 years | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 484  
Interest rate and cross currency interest rate swaps | 1 to 5 years | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 2,051  
Interest rate and cross currency interest rate swaps | Thereafter | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 59  
Interest rate and cross currency interest rate swaps | Thereafter | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,877  
Inflation linked swaps | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 170 $ 155
Inflation linked swaps | Less than 1 year | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 0  
Inflation linked swaps | 1 to 5 years | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 0  
Inflation linked swaps | Thereafter | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount $ 170