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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