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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Derivative Instruments Fair Value Through Profit or Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) $ 15,855 $ 9,966
Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 1,702 2,228
Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 14,153 7,738
Less than 1 year | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 717  
Less than 1 year | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 2,573  
1 to 5 years | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 818  
1 to 5 years | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 7,029  
Thereafter | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 167  
Thereafter | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 4,551  
Foreign exchange contracts    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 4,626 3,482
Foreign exchange contracts | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 1,416 1,768
Foreign exchange contracts | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 3,210 1,714
Foreign exchange contracts | Less than 1 year | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 651  
Foreign exchange contracts | Less than 1 year | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 2,051  
Foreign exchange contracts | 1 to 5 years | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 765  
Foreign exchange contracts | 1 to 5 years | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 1,159  
Foreign exchange contracts | Thereafter | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 0  
Foreign exchange contracts | Thereafter | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 0  
Interest rate swaps, cross currency interest rate swaps and other    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 10,996 6,324
Interest rate swaps, cross currency interest rate swaps and other | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 119 300
Interest rate swaps, cross currency interest rate swaps and other | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 10,943 6,024
Interest rate swaps, cross currency interest rate swaps and other | Less than 1 year | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 66  
Interest rate swaps, cross currency interest rate swaps and other | Less than 1 year | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 522  
Interest rate swaps, cross currency interest rate swaps and other | 1 to 5 years | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 53  
Interest rate swaps, cross currency interest rate swaps and other | 1 to 5 years | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 5,870  
Interest rate swaps, cross currency interest rate swaps and other | Thereafter | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 0  
Interest rate swaps, cross currency interest rate swaps and other | Thereafter | Elected for hedge accounting    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 4,551  
Inflation linked swaps | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 167 $ 160
Inflation linked swaps | Less than 1 year | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 0  
Inflation linked swaps | 1 to 5 years | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 0  
Inflation linked swaps | Thereafter | Fair value through profit or loss    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) 167  
Bank bill swap rate    
Disclosure of detailed information about hedging instruments [line items]    
Notional Amount (U.S. Dollars) $ 1,916