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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Nov. 30, 2019
Mar. 15, 2018
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     $ 14,668 $ 14,668 $ 13,474 $ 9,644
Other comprehensive income (loss)       590 (945) 323
Other items       173 0 0
Balance as       22,177 14,668 13,474
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     641  
Current tax expense reclassified from deferred tax expense         127  
Reclassification adjustments on exchange differences on translation, net of tax         (35)  
Australia District Energy Business            
Disclosure of analysis of other comprehensive income by item [line items]            
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity $ 12          
Reclassification adjustments on exchange differences on translation, net of tax $ (35)          
Chilean toll roads            
Disclosure of analysis of other comprehensive income by item [line items]            
Reclassification adjustments on exchange differences on translation, net of tax     (38)      
Limited Partners            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     4,513 4,513 4,967 4,611
Other comprehensive income (loss)       246 (205) 128
Other items       314 120 6
Balance as       5,048 4,513 4,967
Limited Partners | Accumulated Other Comprehensive Income            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as [1]     209 209 864 736
Other comprehensive income (loss) [1]       246 (205) 128
Other items [1]       18 (450) 0
Balance as [1]       473 209 864
Limited Partners | Revaluation Surplus            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     667 667 976  
Other comprehensive income (loss)       240 141  
Other items       (8) (450)  
Balance as       899 667 976
Limited Partners | Foreign Currency Translation            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     (1,336) (1,336) (835)  
Other comprehensive income (loss)       (8) (501)  
Other items       20 0  
Balance as       (1,324) (1,336) (835)
Limited Partners | Net Investment Hedges            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     95 95 28  
Other comprehensive income (loss)       (71) 67  
Other items       6 0  
Balance as       30 95 28
Limited Partners | Cash Flow Hedges            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     (96) (96) (26)  
Other comprehensive income (loss)       14 (70)  
Other items       0 0  
Balance as       (82) (96) (26)
Limited Partners | Marketable Securities            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     (33) (33) 0  
Other comprehensive income (loss)       33 (33)  
Other items       0 0  
Balance as       0 (33) 0
Limited Partners | Unrealized Actuarial Losses            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     (18) (18) (27)  
Other comprehensive income (loss)       0 9  
Other items       0 0  
Balance as       (18) (18) (27)
Limited Partners | Equity accounted investments            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     930 930 748  
Other comprehensive income (loss)       38 182  
Other items       0 0  
Balance as       968 930 748
General Partner            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     22 22 25 27
Other comprehensive income (loss)       1   (1)
Balance as       24 22 25
General Partner | Accumulated Other Comprehensive Income            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as [1]     3 3 6 7
Other comprehensive income (loss)       1 [1] 0 (1) [1]
Other items       0 (3) [1]  
Balance as [1]       4 3 6
General Partner | Revaluation Surplus            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     5 5 7  
Other comprehensive income (loss)       1 1  
Other items       0 (3)  
Balance as       6 5 7
General Partner | Foreign Currency Translation            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     (9) (9) (6)  
Other comprehensive income (loss)       0 (3)  
Other items       0 0  
Balance as       (9) (9) (6)
General Partner | Net Investment Hedges            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     2 2 1  
Other comprehensive income (loss)       0 1  
Other items       0 0  
Balance as       2 2 1
General Partner | Cash Flow Hedges            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     0 0 0  
Other comprehensive income (loss)       0 0  
Other items       0 0  
Balance as       0 0 0
General Partner | Marketable Securities            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     0 0 0  
Other comprehensive income (loss)       0 0  
Other items       0 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 0  
Other comprehensive income (loss)       0 0  
Other items       0 0  
Balance as       0 0 0
General Partner | Equity accounted investments            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     5 5 4  
Other comprehensive income (loss)       0 1  
Other items       0 0  
Balance as       5 5 4
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     1,823 1,823 2,012 1,860
Other comprehensive income (loss)       103 (87) 56
Other items       98 43 (6)
Balance as       2,039 1,823 2,012
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]     112 112 387 331
Other comprehensive income (loss) [1]       103 (87) 56
Other items [1]       8 (188)  
Balance as [1]       223 112 387
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Revaluation Surplus            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     296 296 425  
Other comprehensive income (loss)       99 59  
Other items       (4) (188)  
Balance as       391 296 425
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     (552) (552) (339)  
Other comprehensive income (loss)       (3) (213)  
Other items       9 0  
Balance as       (546) (552) (339)
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     40 40 11  
Other comprehensive income (loss)       (29) 29  
Other items       3 0  
Balance as       14 40 11
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     (43) (43) (14)  
Other comprehensive income (loss)       6 (29)  
Other items       0 0  
Balance as       (37) (43) (14)
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Marketable Securities            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     (16) (16) (2)  
Other comprehensive income (loss)       14 (14)  
Other items       0 0  
Balance as       (2) (16) (2)
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     (4) (4) (8)  
Other comprehensive income (loss)       0 4  
Other items       0 0  
Balance as       (4) (4) (8)
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     391 391 314  
Other comprehensive income (loss)       16 77  
Other items       0 0  
Balance as       407 391 314
Non-controlling interest— Exchange LP Units | Accumulated Other Comprehensive Income            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     4 4 0  
Other comprehensive income (loss)       1 4  
Other items       0    
Balance as       5 4 0
Non-controlling interest— Exchange LP Units | Revaluation Surplus            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     2 2 0  
Other comprehensive income (loss)       1 2  
Other items       0    
Balance as       3 2 0
Non-controlling interest— Exchange LP Units | Foreign Currency Translation            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     1 1 0  
Other comprehensive income (loss)       0 1  
Other items       0    
Balance as       1 1 0
Non-controlling interest— Exchange LP Units | Net Investment Hedges            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     0 0 0  
Other comprehensive income (loss)       0 0  
Other items       0    
Balance as       0 0 0
Non-controlling interest— Exchange LP Units | Cash Flow Hedges            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     (1) (1) 0  
Other comprehensive income (loss)       0 (1)  
Other items       0    
Balance as       (1) (1) 0
Non-controlling interest— Exchange LP Units | Marketable Securities            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     0 0 0  
Other comprehensive income (loss)       0 0  
Other items       0    
Balance as       0 0 0
Non-controlling interest— Exchange LP Units | Unrealized Actuarial Losses            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     0 0 0  
Other comprehensive income (loss)       0 0  
Other items       0    
Balance as       0 0 0
Non-controlling interest— Exchange LP Units | Equity accounted investments            
Disclosure of analysis of other comprehensive income by item [line items]            
Balance as     $ 2 2 0  
Other comprehensive income (loss)       0 2  
Other items       0    
Balance as       $ 2 $ 2 $ 0
[1] Refer to Note 28 Accumulated Other Comprehensive Income (Loss) for an analysis of accumulated other comprehensive income (loss) by item.