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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Derivative Instruments Fair Value Through Profit or Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount $ 9,966 $ 8,829
Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 2,228 2,433
Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 7,738 6,396
Less than 1 year | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 989  
Less than 1 year | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,605  
1 to 5 years | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,026  
1 to 5 years | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 3,982  
Thereafter | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 213  
Thereafter | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 2,151  
Foreign exchange contracts    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 3,482 3,816
Foreign exchange contracts | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,768 1,447
Foreign exchange contracts | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,714 2,369
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 742  
Foreign exchange contracts | Less than 1 year | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 1,590  
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 1,026  
Foreign exchange contracts | 1 to 5 years | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 124  
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 6,324 4,843
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 300 816
Interest rate and cross currency interest rate swaps | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 6,024 4,027
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 247  
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 15  
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 0  
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 3,858  
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 53  
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 2,151  
Inflation linked swaps | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Total Notional Amount 160 $ 170
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 $ 160