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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jan. 14, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Feb. 06, 2020
Feb. 07, 2019
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as   $ 19,058 $ 16,275 $ 22,177 $ 14,668    
Other comprehensive income (loss)   54 28 (1,756) 106    
Class A Shares of BIPC, Issuance, Value       0      
Other items   0 8 168 173    
Balance as   18,743 16,233 18,743 16,233    
Non-controlling Interest - Exchange LP Units, equity [Member]              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as   14 23 18 71    
Other comprehensive income (loss)   0 0 (2) 0    
Class A Shares of BIPC, Issuance, Value       0      
Other items   (1) (1) (2) (48)    
Balance as   12 21 12 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       5 4    
Other comprehensive income (loss)       (2)      
Balance as   3 4 3 4    
Non-controlling Interest - Exchange LP Units, equity [Member] | Revaluation Surplus              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       3 2    
Other comprehensive income (loss)       0      
Balance as   3 2 3 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 1    
Other comprehensive income (loss)       (2)      
Balance as   (1) 1 (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 0    
Other comprehensive income (loss)       0      
Balance as   0 0 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) (1)    
Other comprehensive income (loss)       0      
Balance as   (1) (1) (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 0    
Other comprehensive income (loss)       0      
Balance as   0 0 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 0    
Other comprehensive income (loss)       0      
Balance as   0 0 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 2    
Other comprehensive income (loss)       0      
Balance as   2 2 2 2    
Non-controlling Interest - Redeemable Partnership Units [Member]              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as   1,606 1,863 2,039 1,823    
Other comprehensive income (loss)   4 (5) (240) (4)    
Class A Shares of BIPC, Issuance, Value       (183)      
Other items   0 2 41 106    
Balance as   1,520 1,815 1,520 1,815    
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   (47) 125 223 112    
Other comprehensive income (loss)   4 (5) (240) (4)    
Class A Shares of BIPC, Issuance, Value       5      
Other items   0 0 (31) 12    
Balance as   (43) 120 (43) 120    
Non-controlling Interest - Redeemable Partnership Units [Member] | Revaluation Surplus              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       391 296    
Other comprehensive income (loss)       (7) 0    
Class A Shares of BIPC, Issuance, Value       0      
Other items       (18) 0    
Balance as   366 296 366 296    
Non-controlling Interest - Redeemable Partnership Units [Member] | Foreign Currency Translation              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       (546) (552)    
Other comprehensive income (loss)       (257) 12    
Class A Shares of BIPC, Issuance, Value       5      
Other items       (13) 9    
Balance as   (811) (531) (811) (531)    
Non-controlling Interest - Redeemable Partnership Units [Member] | Net Investment Hedges              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       14 40    
Other comprehensive income (loss)       19 (8)    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 3    
Balance as   33 35 33 35    
Non-controlling Interest - Redeemable Partnership Units [Member] | Cash Flow Hedges              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       (37) (43)    
Other comprehensive income (loss)       (18) 6    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 0    
Balance as   (55) (37) (55) (37)    
Non-controlling Interest - Redeemable Partnership Units [Member] | Available for sale              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       (2) (16)    
Other comprehensive income (loss)       12 8    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 0    
Balance as   10 (8) 10 (8)    
Non-controlling Interest - Redeemable Partnership Units [Member] | Unrealized Actuarial Losses              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       (4) (4)    
Other comprehensive income (loss)       (1) (1)    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 0    
Balance as   (5) (5) (5) (5)    
Non-controlling Interest - Redeemable Partnership Units [Member] | Equity accounted investments              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       407 391    
Other comprehensive income (loss)       12 (21)    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 0    
Balance as   419 370 419 370    
Limited Partners 1 [Member]              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as   4,008 4,633 5,048 4,513    
Other comprehensive income (loss)   11 (13) (574) (10)    
Class A Shares of BIPC, Issuance, Value       (441)      
Other items   19 7 118 304    
Balance as   3,823 4,521 3,823 4,521    
Limited Partners 1 [Member] | Accumulated other comprehensive income [member]              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as   (168) 238 473 209    
Other comprehensive income (loss)   11 (13) (574) (10)    
Class A Shares of BIPC, Issuance, Value       18      
Other items   0 0 (74) 26    
Balance as   (157) 225 (157) 225    
Limited Partners 1 [Member] | Revaluation Surplus              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       899 667    
Other comprehensive income (loss)       (16) 0    
Class A Shares of BIPC, Issuance, Value       0      
Other items       (43) 0    
Balance as   840 667 840 667    
Limited Partners 1 [Member] | Foreign Currency Translation              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       (1,324) (1,336)    
Other comprehensive income (loss)       (620) 30    
Class A Shares of BIPC, Issuance, Value       18      
Other items       (31) 20    
Balance as   (1,957) (1,286) (1,957) (1,286)    
Limited Partners 1 [Member] | Net Investment Hedges              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       30 95    
Other comprehensive income (loss)       46 (21)    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 6    
Balance as   76 80 76 80    
Limited Partners 1 [Member] | Cash Flow Hedges              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       (82) (96)    
Other comprehensive income (loss)       (42) 13    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 0    
Balance as   (124) (83) (124) (83)    
Limited Partners 1 [Member] | Available for sale              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       0 (33)    
Other comprehensive income (loss)       30 21    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 0    
Balance as   30 (12) 30 (12)    
Limited Partners 1 [Member] | Unrealized Actuarial Losses              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       (18) (18)    
Other comprehensive income (loss)       0 (2)    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 0    
Balance as   (18) (20) (18) (20)    
Limited Partners 1 [Member] | Equity accounted investments              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       968 930    
Other comprehensive income (loss)       28 (51)    
Class A Shares of BIPC, Issuance, Value       0      
Other items       0 0    
Balance as   996 879 996 879    
Non-controlling Interest - Class A Shares, equity [Member]              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as   625   0      
Other comprehensive income (loss)   2   1      
Class A Shares of BIPC, Issuance, Value       626      
Other items   (18)   (18)      
Balance as   576   576      
Non-controlling Interest - Class A Shares, equity [Member] | Accumulated other comprehensive income [member]              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       0      
Other comprehensive income (loss)       1      
Class A Shares of BIPC, Issuance, Value       (23)      
Balance as   (22)   (22)      
Non-controlling Interest - Class A Shares, equity [Member] | Revaluation Surplus              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       0      
Other comprehensive income (loss)       0      
Class A Shares of BIPC, Issuance, Value       0      
Balance as   0   0      
Non-controlling Interest - Class A Shares, equity [Member] | Foreign Currency Translation              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       0      
Other comprehensive income (loss)       0      
Class A Shares of BIPC, Issuance, Value       (23)      
Balance as   (23)   (23)      
Non-controlling Interest - Class A Shares, equity [Member] | Net Investment Hedges              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       0      
Other comprehensive income (loss)       0      
Class A Shares of BIPC, Issuance, Value       0      
Balance as   0   0      
Non-controlling Interest - Class A Shares, equity [Member] | Cash Flow Hedges              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       0      
Other comprehensive income (loss)       5      
Class A Shares of BIPC, Issuance, Value       0      
Balance as   5   5      
Non-controlling Interest - Class A Shares, equity [Member] | Available for sale              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       0      
Other comprehensive income (loss)       4      
Class A Shares of BIPC, Issuance, Value       0      
Balance as   4   4      
Non-controlling Interest - Class A Shares, equity [Member] | Unrealized Actuarial Losses              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       0      
Other comprehensive income (loss)       (1)      
Class A Shares of BIPC, Issuance, Value       0      
Balance as   (1)   (1)      
Non-controlling Interest - Class A Shares, equity [Member] | Equity accounted investments              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       0      
Other comprehensive income (loss)       (7)      
Class A Shares of BIPC, Issuance, Value       0      
Balance as   (7)   (7)      
General Partner 1 [Member]              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as   19 22 24 22    
Other comprehensive income (loss)   0 0 (3)      
Class A Shares of BIPC, Issuance, Value       (2)      
Other items     0 0 0    
Balance as   17 23 17 23    
General Partner 1 [Member] | Accumulated other comprehensive income [member]              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       4 3    
Other comprehensive income (loss)       (3)      
Balance as   1 3 1 3    
General Partner 1 [Member] | Revaluation Surplus              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       6 5    
Other comprehensive income (loss)       0      
Balance as   6 5 6 5    
General Partner 1 [Member] | Foreign Currency Translation              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       (9) (9)    
Other comprehensive income (loss)       (3)      
Balance as   (12) (9) (12) (9)    
General Partner 1 [Member] | Net Investment Hedges              
Disclosure of analysis of other comprehensive income by item [line items]              
Balance as       2 2    
Other comprehensive income (loss)       0      
Balance as   2 2 2 2    
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      
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      
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      
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 5    
Other comprehensive income (loss)       0      
Balance as   $ 5 $ 5 5 5    
Chilean toll roads              
Disclosure of analysis of other comprehensive income by item [line items]              
Reclassification adjustments on exchange differences on translation, before tax       44 $ 38    
Disposal of ownership interest, percentage           33.00% 33.00%
Colombian Regulated Distribution Operation [Member]              
Disclosure of analysis of other comprehensive income by item [line items]              
Reclassification adjustments on exchange differences on translation, before tax $ 44            
Disposal of ownership interest, percentage 17.00%            
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity       $ 61