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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
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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 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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