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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Feb. 07, 2019
Nov. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     $ 22,177 $ 14,668 $ 13,474
Other comprehensive income (loss)     (62) 590 (945)
Issuance of class A shares of BIPC [1],[2]     0    
Other items [4]     104 [3] 173 0
Balance as     21,673 22,177 14,668
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)   $ 44 $ 38  
Disposal of ownership interest, percentage     33.00% 33.00%  
Colombian regulated distribution operation          
Disclosure of analysis of other comprehensive income by item [line items]          
Reclassification adjustments on exchange differences on translation, net of tax     $ 61    
Disposal of ownership interest, percentage     17.00%    
Texas electricity transmission project          
Disclosure of analysis of other comprehensive income by item [line items]          
Reclassification adjustments on exchange differences on translation, net of tax     $ 25    
Disposal of ownership interest, percentage     11.00%    
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)   $ 12  
Limited Partners          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     $ 5,048 4,513 4,967
Other comprehensive income (loss)     (11) 246 (205)
Issuance of class A shares of BIPC [1],[2]     (441)    
Other items [4]     110 [3] 314 120
Balance as     4,233 5,048 4,513
Limited Partners | Accumulated Other Comprehensive Income          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as [4]     473 209 864
Other comprehensive income (loss) [4]     (11) 246 (205)
Issuance of class A shares of BIPC [1],[2],[4]     18    
Other items [4]     (28) [3] 18 (450)
Balance as [4]     452 473 209
Limited Partners | Revaluation Surplus          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     899 667  
Other comprehensive income (loss)     175 240  
Issuance of class A shares of BIPC     0    
Other items     (59) (8)  
Balance as     1,015 899 667
Limited Partners | Foreign Currency Translation          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (1,324) (1,336)  
Other comprehensive income (loss)     (287) (8)  
Issuance of class A shares of BIPC     18    
Other items     31 20  
Balance as     (1,562) (1,324) (1,336)
Limited Partners | Net Investment Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     30 95  
Other comprehensive income (loss)     7 (71)  
Issuance of class A shares of BIPC     0    
Other items     0 6  
Balance as     37 30 95
Limited Partners | Cash Flow Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (82) (96)  
Other comprehensive income (loss)     68 14  
Issuance of class A shares of BIPC     0    
Other items     0 0  
Balance as     (14) (82) (96)
Limited Partners | Marketable Securities          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0 (33)  
Other comprehensive income (loss)     39 33  
Issuance of class A shares of BIPC     0    
Other items     0 0  
Balance as     39 0 (33)
Limited Partners | Unrealized Actuarial Losses          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (18) (18)  
Other comprehensive income (loss)     (18) 0  
Issuance of class A shares of BIPC     0    
Other items     0 0  
Balance as     (36) (18) (18)
Limited Partners | Equity accounted investments          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     968 930  
Other comprehensive income (loss)     5 38  
Issuance of class A shares of BIPC     0    
Other items     0 0  
Balance as     973 968 930
General partner          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     24 22 25
Other comprehensive income (loss)     (1) 1  
Issuance of class A shares of BIPC [1],[2]     (2)    
Balance as     19 24 22
General partner | Accumulated Other Comprehensive Income          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     4 3  
Other comprehensive income (loss)     (1) 1  
Balance as     3 4 3
General partner | Revaluation Surplus          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     6 5  
Other comprehensive income (loss)     1 1  
Balance as     7 6 5
General partner | Foreign Currency Translation          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     (9) (9)  
Other comprehensive income (loss)     (3) 0  
Balance as     (12) (9) (9)
General partner | Net Investment Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     2 2  
Other comprehensive income (loss)     0 0  
Balance as     2 2 2
General partner | Cash Flow Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0 0  
Other comprehensive income (loss)     1 0  
Balance as     1 0 0
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  
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  
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  
Other comprehensive income (loss)     0 0  
Balance as     5 5 5
 Non-Controlling Interest—Redeemable Partnership Units held by Brookfield          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     2,039 1,823 2,012
Other comprehensive income (loss)     (7) 103 (87)
Issuance of class A shares of BIPC [1],[2]     (183)    
Other items [4]     36 [3] 98 43
Balance as     1,687 2,039 1,823
 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     223 112 387
Other comprehensive income (loss)     (7) 103 (87)
Issuance of class A shares of BIPC [1],[2]     5    
Other items [4]     (12) [3] 8 (188)
Balance as     209 223 112
 Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Revaluation Surplus          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     391 296  
Other comprehensive income (loss)     72 99  
Issuance of class A shares of BIPC     0    
Other items     (25) (4)  
Balance as     438 391 296
 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     (546) (552)  
Other comprehensive income (loss)     (119) (3)  
Issuance of class A shares of BIPC     5    
Other items     13 9  
Balance as     (647) (546) (552)
 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     14 40  
Other comprehensive income (loss)     3 (29)  
Issuance of class A shares of BIPC     0    
Other items     0 3  
Balance as     17 14 40
 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     (37) (43)  
Other comprehensive income (loss)     28 6  
Issuance of class A shares of BIPC     0    
Other items     0 0  
Balance as     (9) (37) (43)
 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) (16)  
Other comprehensive income (loss)     15 14  
Issuance of class A shares of BIPC     0    
Other items     0 0  
Balance as     13 (2) (16)
 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)  
Other comprehensive income (loss)     (8) 0  
Issuance of class A shares of BIPC     0    
Other items     0 0  
Balance as     (12) (4) (4)
 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     407 391  
Other comprehensive income (loss)     2 16  
Issuance of class A shares of BIPC     0    
Other items     0 0  
Balance as     409 407 391
Non-controlling interest— BIPC exchangeable shares          
Disclosure of analysis of other comprehensive income by item [line items]          
Reclassification adjustments on exchange differences on translation, net of tax     23    
Non-controlling interest— BIPC exchangeable shares | Accumulated Other Comprehensive Income          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     87    
Issuance of class A shares of BIPC     (23)    
Other items     (2)    
Balance as     62 0  
Non-controlling interest— BIPC exchangeable shares | Revaluation Surplus          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     29    
Issuance of class A shares of BIPC     0    
Other items     (2)    
Balance as     27 0  
Non-controlling interest— BIPC exchangeable shares | Foreign Currency Translation          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     51    
Issuance of class A shares of BIPC     (23)    
Other items     0    
Balance as     28 0  
Non-controlling interest— BIPC exchangeable shares | Net Investment Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     (6)    
Issuance of class A shares of BIPC     0    
Other items     0    
Balance as     (6) 0  
Non-controlling interest— BIPC exchangeable shares | Cash Flow Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     22    
Issuance of class A shares of BIPC     0    
Other items     0    
Balance as     22 0  
Non-controlling interest— BIPC exchangeable shares | Marketable Securities          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     5    
Issuance of class A shares of BIPC     0    
Other items     0    
Balance as     5 0  
Non-controlling interest— BIPC exchangeable shares | Unrealized Actuarial Losses          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     (3)    
Issuance of class A shares of BIPC     0    
Other items     0    
Balance as     (3) 0  
Non-controlling interest— BIPC exchangeable shares | Equity accounted investments          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     0    
Other comprehensive income (loss)     (11)    
Issuance of class A shares of BIPC     0    
Other items     0    
Balance as     (11) 0  
Non-controlling interest— Exchange LP Units | Accumulated Other Comprehensive Income          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     5 4  
Other comprehensive income (loss)     0 1  
Other items     0    
Balance as     5 5 4
Non-controlling interest— Exchange LP Units | Revaluation Surplus          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     3 2  
Other comprehensive income (loss)     1 1  
Other items     0    
Balance as     4 3 2
Non-controlling interest— Exchange LP Units | Foreign Currency Translation          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     1 1  
Other comprehensive income (loss)     (2) 0  
Other items     0    
Balance as     (1) 1 1
Non-controlling interest— Exchange LP Units | Net Investment Hedges          
Disclosure of analysis of other comprehensive income by item [line items]          
Balance as     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)  
Other comprehensive income (loss)     1 0  
Other items     0    
Balance as     0 (1) (1)
Non-controlling interest— Exchange LP Units | 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     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  
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  
Other comprehensive income (loss)     0 0  
Other items     0    
Balance as     $ 2 $ 2 $ 2
[1] Refer to Note 1, Organization and Description of the Business.
[2] Refer to Note 26, Partnership Capital.
[3] Refer to Note 6, Acquisition of Businesses.
[4] Refer to Note 27, Accumulated Other Comprehensive Income (Loss).