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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [line items]          
Equity, Adjusted Balance, Total         $ 13,490
Balance as $ 16,275 $ 13,607 $ 14,668 $ 13,474  
Other comprehensive income (loss) 28 (1,049) 106 (1,017)  
Other items 8   173 0  
Balance as 16,233 12,276 16,233 12,276  
Current tax expense (income) 62 46 125 216  
Chilean electricity transmission operation [Member]          
Disclosure of analysis of other comprehensive income by item [line items]          
Increase (decrease) through appropriation of retained earnings, equity     641    
Current tax expense (income)     127    
Limited Partners 1 [Member]          
Disclosure of analysis of other comprehensive income by item [line items]          
Equity, Adjusted Balance, Total         4,971
Balance as 4,633 4,977 4,513 4,967  
Other comprehensive income (loss) (13) (363) (10) (347)  
Other items 7   304    
Balance as 4,521 4,545 4,521 4,545  
Limited Partners 1 [Member] | Accumulated other comprehensive income [member]          
Disclosure of analysis of other comprehensive income by item [line items]          
Equity, Adjusted Balance, Total         864
Balance as 238 430 209 864  
Other comprehensive income (loss) (13) (363) (10) (347)  
Other items 0   26 (450)  
Balance as 225 67 225 67  
Limited Partners 1 [Member] | Revaluation Surplus          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     667 976  
Other comprehensive income (loss)     0 0  
Other items     0 (450)  
Balance as 667 526 667 526  
Limited Partners 1 [Member] | Foreign Currency Translation          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (1,336) (835)  
Other comprehensive income (loss)     30 (380)  
Other items     20 0  
Balance as (1,286) (1,215) (1,286) (1,215)  
Limited Partners 1 [Member] | Net Investment Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     95 28  
Other comprehensive income (loss)     (21) 34  
Other items     6 0  
Balance as 80 62 80 62  
Limited Partners 1 [Member] | Cash Flow Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (96) (26)  
Other comprehensive income (loss)     13 (37)  
Other items     0 0  
Balance as (83) (63) (83) (63)  
Limited Partners 1 [Member] | Available for sale          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (33) 0  
Other comprehensive income (loss)     21 (8)  
Other items     0 0  
Balance as (12) (8) (12) (8)  
Limited Partners 1 [Member] | Unrealized Actuarial Losses          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (18) (27)  
Other comprehensive income (loss)     (2) 0  
Other items     0 0  
Balance as (20) (27) (20) (27)  
Limited Partners 1 [Member] | Equity accounted investments          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     930 748  
Other comprehensive income (loss)     (51) 44  
Other items     0 0  
Balance as 879 792 879 792  
General Partner 1 [Member]          
Disclosure of analysis of other comprehensive income by item [line items]          
Equity, Adjusted Balance, Total         25
Balance as 22 25 22 25  
Other comprehensive income (loss) 0 (2)   (2)  
Balance as 23 22 23 22  
General Partner 1 [Member] | Accumulated other comprehensive income [member]          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as 3 3 3 6  
Other comprehensive income (loss) 0 (2)   (2)  
Other items 0   0 (3)  
Balance as 3 1 3 1  
General Partner 1 [Member] | Revaluation Surplus          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     5 7  
Other comprehensive income (loss)       0  
Other items     0 (3)  
Balance as 5 4 5 4  
General Partner 1 [Member] | Foreign Currency Translation          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (9) (6)  
Other comprehensive income (loss)       (2)  
Other items     0 0  
Balance as (9) (8) (9) (8)  
General Partner 1 [Member] | Net Investment Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     2 1  
Other comprehensive income (loss)       0  
Other items     0 0  
Balance as 2 1 2 1  
General Partner 1 [Member] | Cash Flow Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0 0  
Other comprehensive income (loss)       0  
Other items     0 0  
Balance as 0 0 0 0  
General Partner 1 [Member] | Available for sale          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0 0  
Other comprehensive income (loss)       0  
Other items     0 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  
Other comprehensive income (loss)       0  
Other items     0 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     5 4  
Other comprehensive income (loss)       0  
Other items     0 0  
Balance as 5 4 5 4  
Non-controlling Interest - Redeemable Partnership Units [Member]          
Disclosure of analysis of other comprehensive income by item [line items]          
Equity, Adjusted Balance, Total         2,014
Balance as 1,863 2,014 1,823 2,012  
Other comprehensive income (loss) (5) (152) (4) (147)  
Other items 2   106    
Balance as 1,815 1,832 1,815 1,832  
Non-controlling Interest - Redeemable Partnership Units [Member] | Accumulated other comprehensive income [member]          
Disclosure of analysis of other comprehensive income by item [line items]          
Equity, Adjusted Balance, Total         $ 387
Balance as 125 204 112 387  
Other comprehensive income (loss) (5) (152) (4) (147)  
Other items 0   12 (188)  
Balance as 120 52 120 52  
Non-controlling Interest - Redeemable Partnership Units [Member] | Revaluation Surplus          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     296 425  
Other comprehensive income (loss)     0 0  
Other items     0 (188)  
Balance as 296 237 296 237  
Non-controlling Interest - Redeemable Partnership Units [Member] | Foreign Currency Translation          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (552) (339)  
Other comprehensive income (loss)     12 (159)  
Other items     9 0  
Balance as (531) (498) (531) (498)  
Non-controlling Interest - Redeemable Partnership Units [Member] | Net Investment Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     40 11  
Other comprehensive income (loss)     (8) 13  
Other items     3 0  
Balance as 35 24 35 24  
Non-controlling Interest - Redeemable Partnership Units [Member] | Cash Flow Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (43) (14)  
Other comprehensive income (loss)     6 (16)  
Other items     0 0  
Balance as (37) (30) (37) (30)  
Non-controlling Interest - Redeemable Partnership Units [Member] | Available for sale          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (16) (2)  
Other comprehensive income (loss)     8 (4)  
Other items     0 0  
Balance as (8) (6) (8) (6)  
Non-controlling Interest - Redeemable Partnership Units [Member] | Unrealized Actuarial Losses          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (4) (8)  
Other comprehensive income (loss)     (1) 0  
Other items     0 0  
Balance as (5) (8) (5) (8)  
Non-controlling Interest - Redeemable Partnership Units [Member] | Equity accounted investments          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     391 314  
Other comprehensive income (loss)     (21) 19  
Other items     0 0  
Balance as 370 $ 333 370 $ 333  
Non-controlling Interest - Exchange LP Units, equity [Member]          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as 23        
Other items (1)   (48)    
Balance as 21   21    
Non-controlling Interest - Exchange LP Units, equity [Member] | Accumulated other comprehensive income [member]          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     4    
Other comprehensive income (loss)     0    
Balance as 4   4    
Non-controlling Interest - Exchange LP Units, equity [Member] | Revaluation Surplus          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     2    
Other comprehensive income (loss)     0    
Balance as 2   2    
Non-controlling Interest - Exchange LP Units, equity [Member] | Foreign Currency Translation          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     1    
Other comprehensive income (loss)     0    
Balance as 1   1    
Non-controlling Interest - Exchange LP Units, equity [Member] | Net Investment Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     0    
Balance as 0   0    
Non-controlling Interest - Exchange LP Units, equity [Member] | Cash Flow Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (1)    
Other comprehensive income (loss)     0    
Balance as (1)   (1)    
Non-controlling Interest - Exchange LP Units, equity [Member] | Available for sale          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     0    
Balance as 0   0    
Non-controlling Interest - Exchange LP Units, equity [Member] | Unrealized Actuarial Losses          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     0    
Balance as 0   0    
Non-controlling Interest - Exchange LP Units, equity [Member] | Equity accounted investments          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     2    
Other comprehensive income (loss)     0    
Balance as $ 2   $ 2