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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
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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 |

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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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