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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as $ 13,474 $ 9,644 $ 7,176
Other comprehensive income (loss) (945) 323 576
Other items (note 26) 0 0 9
Balance as 14,668 13,474 9,644
Chilean electricity transmission operation      
Disclosure of analysis of other comprehensive income by item [line items]      
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity 641    
Current tax expense reclassified from deferred tax expense 127    
Limited Partners      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 4,967 4,611 3,838
Other comprehensive income (loss) (205) 128 358
Other items (note 26) 120 6 17
Balance as 4,513 4,967 4,611
Limited Partners | Accumulated Other Comprehensive Income      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as [1] 864 736 555
Other comprehensive income (loss) [1] (205) 128 358
Other items (note 26) [1] (450)   (177)
Balance as [1] 209 864 736
Limited Partners | Revaluation Surplus      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 976 957  
Other comprehensive income (loss) 141 19  
Other items (note 26) (450)    
Balance as 667 976 957
Limited Partners | Foreign Currency Translation      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as (835) (891)  
Other comprehensive income (loss) (501) 56  
Other items (note 26) 0    
Balance as (1,336) (835) (891)
Limited Partners | Net Investment Hedges      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 28 215  
Other comprehensive income (loss) 67 (187)  
Other items (note 26) 0    
Balance as 95 28 215
Limited Partners | Cash Flow Hedges      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as (26) (130)  
Other comprehensive income (loss) (70) 104  
Other items (note 26) 0    
Balance as (96) (26) (130)
Limited Partners | Marketable Securities      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 0 (4)  
Other comprehensive income (loss) (33) 4  
Other items (note 26) 0    
Balance as (33) 0 (4)
Limited Partners | Unrealized Actuarial Losses      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as (27) (30)  
Other comprehensive income (loss) 9 3  
Other items (note 26) 0    
Balance as (18) (27) (30)
Limited Partners | Equity accounted investments      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 748 619  
Other comprehensive income (loss) 182 129  
Other items (note 26) 0    
Balance as 930 748 619
General Partner      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 25 27 23
Other comprehensive income (loss) 0 (1) 4
Balance as 22 25 27
General Partner | Accumulated Other Comprehensive Income      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as [1] 6 7 4
Other comprehensive income (loss) 0 (1) [1] 4 [1]
Other items (note 26) [1] (3)   (1)
Balance as [1] 3 6 7
General Partner | Revaluation Surplus      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 7 7  
Other comprehensive income (loss) 1 0  
Other items (note 26) (3)    
Balance as 5 7 7
General Partner | Foreign Currency Translation      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as (6) (5)  
Other comprehensive income (loss) (3) (1)  
Other items (note 26) 0    
Balance as (9) (6) (5)
General Partner | Net Investment Hedges      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 1 3  
Other comprehensive income (loss) 1 (2)  
Other items (note 26) 0    
Balance as 2 1 3
General Partner | Cash Flow Hedges      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 0 (1)  
Other comprehensive income (loss) 0 1  
Other items (note 26) 0    
Balance as 0 0 (1)
General Partner | Marketable Securities      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 0 0  
Other comprehensive income (loss) 0 0  
Other items (note 26) 0    
Balance as 0 0 0
General Partner | Unrealized Actuarial Losses      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 0 0  
Other comprehensive income (loss) 0 0  
Other items (note 26) 0    
Balance as 0 0 0
General Partner | Equity accounted investments      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 4 3  
Other comprehensive income (loss) 1 1  
Other items (note 26) 0    
Balance as 5 4 3
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 2,012 1,860 1,518
Other comprehensive income (loss) (87) 56 147
Other items (note 26) 43 (6) (15)
Balance as 1,823 2,012 1,860
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Accumulated Other Comprehensive Income      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as [1] 387 331 254
Other comprehensive income (loss) [1] (87) 56 147
Other items (note 26) [1] (188)   (70)
Balance as [1] 112 387 331
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Revaluation Surplus      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 425 417  
Other comprehensive income (loss) 59 8  
Other items (note 26) (188)    
Balance as 296 425 417
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Foreign Currency Translation      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as (339) (365)  
Other comprehensive income (loss) (213) 26  
Other items (note 26) 0    
Balance as (552) (339) (365)
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Net Investment Hedges      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 11 88  
Other comprehensive income (loss) 29 (77)  
Other items (note 26) 0    
Balance as 40 11 88
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Cash Flow Hedges      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as (14) (58)  
Other comprehensive income (loss) (29) 44  
Other items (note 26) 0    
Balance as (43) (14) (58)
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Marketable Securities      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as (2) (3)  
Other comprehensive income (loss) (14) 1  
Other items (note 26) 0    
Balance as (16) (2) (3)
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Unrealized Actuarial Losses      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as (8) (9)  
Other comprehensive income (loss) 4 1  
Other items (note 26) 0    
Balance as (4) (8) (9)
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Equity accounted investments      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 314 261  
Other comprehensive income (loss) 77 53  
Other items (note 26) 0    
Balance as 391 314 $ 261
Non-controlling Interest - Exchange LP Units, equity [Member]      
Disclosure of analysis of other comprehensive income by item [line items]      
Other comprehensive income (loss) 4    
Other items (note 26) (163)    
Balance as 71    
Non-controlling Interest - Exchange LP Units, equity [Member] | Accumulated Other Comprehensive Income      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 0    
Other comprehensive income (loss) 4    
Balance as 4 0  
Non-controlling Interest - Exchange LP Units, equity [Member] | Revaluation Surplus      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 0    
Other comprehensive income (loss) 2    
Balance as 2 0  
Non-controlling Interest - Exchange LP Units, equity [Member] | Foreign Currency Translation      
Disclosure of analysis of other comprehensive income by item [line items]      
Balance as 0    
Other comprehensive income (loss) 1    
Balance as 1 0  
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 0    
Other comprehensive income (loss) (1)    
Balance as (1) 0  
Non-controlling Interest - Exchange LP Units, equity [Member] | Marketable Securities      
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 0    
Other comprehensive income (loss) 2    
Balance as $ 2 $ 0  
[1] Refer to Note 27, Accumulated Other Comprehensive Income (Loss) for an analysis of accumulated other comprehensive income (loss) by item.