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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as | $ 13,607 | $ 13,474 | $ 9,774 | $ 13,474 | $ 9,644
Other comprehensive income (loss) | (1,049) |  | (335) | (1,017) | (269)
Other items |  |  |  | 0 |
Current tax expense (income) | 46 |  | 38 | 216 | 50
Balance as | 12,276 | 13,607 | 12,624 | 12,276 | 12,624
Chilean electricity transmission operation [Member] |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Current tax expense (income) |  | 129 |  | 127 |
Limited Partners 1 [Member] |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as | 4,977 | 4,967 | 4,488 | 4,967 | 4,611
Other comprehensive income (loss) | (363) |  | (111) | (347) | (119)
Balance as | 4,545 | 4,977 | 4,253 | 4,545 | 4,253
Limited Partners 1 [Member] | Accumulated other comprehensive income [member] |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as | 430 | 864 | 728 | 864 | 736
Other comprehensive income (loss) | (363) |  | (111) | (347) | (119)
Other items |  |  |  | (450) |
Balance as | 67 | 430 | 617 | 67 | 617
Limited Partners 1 [Member] | Revaluation Surplus |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 976 |  | 976 | 957
Other comprehensive income (loss) |  |  |  | 0 | 0
Other items |  |  |  | (450) |
Balance as | 526 |  | 957 | 526 | 957
Limited Partners 1 [Member] | Foreign Currency Translation |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | (835) |  | (835) | (891)
Other comprehensive income (loss) |  |  |  | (380) | 30
Other items |  |  |  | 0 |
Balance as | (1,215) |  | (861) | (1,215) | (861)
Limited Partners 1 [Member] | Net Investment Hedges |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 28 |  | 28 | 215
Other comprehensive income (loss) |  |  |  | 34 | (138)
Other items |  |  |  | 0 |
Balance as | 62 |  | 77 | 62 | 77
Limited Partners 1 [Member] | Cash Flow Hedges |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | (26) |  | (26) | (130)
Other comprehensive income (loss) |  |  |  | (37) | 24
Other items |  |  |  | 0 |
Balance as | (63) |  | (106) | (63) | (106)
Limited Partners 1 [Member] | Available for sale |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 0 |  | 0 | (4)
Other comprehensive income (loss) |  |  |  | (8) | 2
Other items |  |  |  | 0 |
Balance as | (8) |  | (2) | (8) | (2)
Limited Partners 1 [Member] | Unrealized Actuarial Losses |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | (27) |  | (27) | (30)
Other comprehensive income (loss) |  |  |  | 0 | 0
Other items |  |  |  | 0 |
Balance as | (27) |  | (30) | (27) | (30)
Limited Partners 1 [Member] | Equity accounted investments |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 748 |  | 748 | 619
Other comprehensive income (loss) |  |  |  | 44 | (37)
Other items |  |  |  | 0 |
Balance as | 792 |  | 582 | 792 | 582
General Partner 1 [Member] |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as | 25 | 25 | 27 | 25 | 27
Other comprehensive income (loss) | (2) |  | (1) | (2) | (1)
Balance as | 22 | 25 | 26 | 22 | 26
General Partner 1 [Member] | Accumulated other comprehensive income [member] |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as | 3 | 6 | 7 | 6 | 7
Other comprehensive income (loss) | (2) |  | (1) | (2) | (1)
Other items |  |  |  | (3) |
Balance as | 1 | 3 | 6 | 1 | 6
General Partner 1 [Member] | Revaluation Surplus |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 7 |  | 7 | 7
Other comprehensive income (loss) |  |  |  |  | 0
Other items |  |  |  | (3) |
Balance as | 4 |  | 7 | 4 | 7
General Partner 1 [Member] | Foreign Currency Translation |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | (6) |  | (6) | (5)
Other comprehensive income (loss) |  |  |  | (2) | 0
Other items |  |  |  | 0 |
Balance as | (8) |  | (5) | (8) | (5)
General Partner 1 [Member] | Net Investment Hedges |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 1 |  | 1 | 3
Other comprehensive income (loss) |  |  |  | 0 | (1)
Other items |  |  |  | 0 |
Balance as | 1 |  | 2 | 1 | 2
General Partner 1 [Member] | Cash Flow Hedges |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 0 |  | 0 | (1)
Other comprehensive income (loss) |  |  |  |  | 0
Other items |  |  |  | 0 |
Balance as | 0 |  | (1) | 0 | (1)
General Partner 1 [Member] | Available for sale |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 0 |  | 0 | 0
Other comprehensive income (loss) |  |  |  |  | 0
Other items |  |  |  | 0 |
Balance as | 0 |  | 0 | 0 | 0
General Partner 1 [Member] | Unrealized Actuarial Losses |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 0 |  | 0 | 0
Other comprehensive income (loss) |  |  |  |  | 0
Other items |  |  |  | 0 |
Balance as | 0 |  | 0 | 0 | 0
General Partner 1 [Member] | Equity accounted investments |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 4 |  | 4 | 3
Other comprehensive income (loss) |  |  |  |  | 0
Other items |  |  |  | 0 |
Balance as | 4 |  | 3 | 4 | 3
Non-controlling Interest - Redeemable Partnership Units [Member] |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as | 2,014 | 2,012 | 1,805 | 2,012 | 1,860
Other comprehensive income (loss) | (152) |  | (46) | (147) | (50)
Balance as | 1,832 | 2,014 | 1,705 | 1,832 | 1,705
Non-controlling Interest - Redeemable Partnership Units [Member] | Accumulated other comprehensive income [member] |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as | 204 | 387 | 327 | 387 | 331
Other comprehensive income (loss) | (152) |  | (46) | (147) | (50)
Other items |  |  |  | (188) |
Balance as | 52 | 204 | 281 | 52 | 281
Non-controlling Interest - Redeemable Partnership Units [Member] | Revaluation Surplus |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 425 |  | 425 | 417
Other comprehensive income (loss) |  |  |  | 0 | 0
Other items |  |  |  | (188) |
Balance as | 237 |  | 417 | 237 | 417
Non-controlling Interest - Redeemable Partnership Units [Member] | Foreign Currency Translation |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | (339) |  | (339) | (365)
Other comprehensive income (loss) |  |  |  | (159) | 13
Other items |  |  |  | 0 |
Balance as | (498) |  | (352) | (498) | (352)
Non-controlling Interest - Redeemable Partnership Units [Member] | Net Investment Hedges |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | 11 |  | 11 | 88
Other comprehensive income (loss) |  |  |  | 13 | (58)
Other items |  |  |  | 0 |
Balance as | 24 |  | 30 | 24 | 30
Non-controlling Interest - Redeemable Partnership Units [Member] | Cash Flow Hedges |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | (14) |  | (14) | (58)
Other comprehensive income (loss) |  |  |  | (16) | 10
Other items |  |  |  | 0 |
Balance as | (30) |  | (48) | (30) | (48)
Non-controlling Interest - Redeemable Partnership Units [Member] | Available for sale |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | (2) |  | (2) | (3)
Other comprehensive income (loss) |  |  |  | (4) | 0
Other items |  |  |  | 0 |
Balance as | (6) |  | (3) | (6) | (3)
Non-controlling Interest - Redeemable Partnership Units [Member] | Unrealized Actuarial Losses |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | (8) |  | (8) | (9)
Other comprehensive income (loss) |  |  |  | 0 | 0
Other items |  |  |  | 0 |
Balance as | (8) |  | (9) | (8) | (9)
Non-controlling Interest - Redeemable Partnership Units [Member] | Equity accounted investments |  |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |  |
Balance as |  | $ 314 |  | 314 | 261
Other comprehensive income (loss) |  |  |  | 19 | (15)
Other items |  |  |  | 0 |
Balance as | $ 333 |  | $ 246 | $ 333 | $ 246

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