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PARTNERSHIP CAPITAL - Capital Categories (Details)
shares in Millions, $ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jul. 29, 2020
CAD ($)
shares
Oct. 16, 2018
USD ($)
shares
Jul. 31, 2019
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Changes in equity [abstract]            
Balance as       $ 22,177 $ 14,668 $ 13,474
Unit issuance [1]       9 809 588
Unit repurchases [1]         (29) (31)
Balance as       21,673 22,177 14,668
Limited Partners            
Changes in equity [abstract]            
Balance as       5,048 4,513 4,967
Unit issuance [1]       9 559 14
Unit repurchases [1]         (28) (30)
Balance as       4,233 5,048 4,513
 Non-Controlling Interest—Redeemable Partnership Units held by Brookfield            
Changes in equity [abstract]            
Balance as       2,039 1,823 2,012
Unit issuance [1]       0 250  
Balance as       $ 1,687 $ 2,039 $ 1,823
Partners' capital | Special General Partner and Limited Partner            
Changes in equity [abstract]            
Opening balance (in shares) | shares       295.1 278.9 278.2
Issued for cash (in shares) | shares       0.2 13.8 0.3
Conversion from Exchange LP Units (in shares) | shares       0.3 3.2 1.3
Conversion from BIPC exchangeable shares (in shares) | shares       1.4 0.0 0.0
Repurchased and cancelled (in shares) | shares       0.0 0.8 0.9
Ending balance (in shares) | shares       297.0 295.1 278.9
Balance as       $ 5,514 $ 4,930 $ 4,926
Unit issuance       9 559 14
Conversion from Exchange LP Units       3 53 20
Conversion from BIPC exchangeable shares       19 0 0
Unit repurchases       0 (28) (30)
Balance as       $ 5,545 $ 5,514 $ 4,930
Partners' capital | Special General Partner            
Changes in equity [abstract]            
Opening balance (in shares) | shares       1.6 1.6 1.6
Issued for cash (in shares) | shares       0.0 0.0 0.0
Conversion from Exchange LP Units (in shares) | shares       0.0 0.0 0.0
Conversion from BIPC exchangeable shares (in shares) | shares       0.0 0.0 0.0
Repurchased and cancelled (in shares) | shares       0.0 0.0 0.0
Ending balance (in shares) | shares       1.6 1.6 1.6
Balance as       $ 19 $ 19 $ 19
Unit issuance       0 0 0
Conversion from Exchange LP Units       0 0 0
Conversion from BIPC exchangeable shares       0 0 0
Unit repurchases       0 0 0
Balance as       $ 19 $ 19 $ 19
Partners' capital | Limited Partners            
Changes in equity [abstract]            
Opening balance (in shares) | shares       293.5 277.3 276.6
Issued for cash (in shares) | shares     13.5 0.2 13.8 0.3
Conversion from Exchange LP Units (in shares) | shares       0.3 3.2 1.3
Conversion from BIPC exchangeable shares (in shares) | shares       1.4 0.0 0.0
Repurchased and cancelled (in shares) | shares       0.0 0.8 0.9
Ending balance (in shares) | shares       295.4 293.5 277.3
Balance as       $ 5,495 $ 4,911 $ 4,907
Unit issuance [1]       9 559 14
Conversion from Exchange LP Units       3 53 20
Conversion from BIPC exchangeable shares       19 0 0
Unit repurchases       0 (28) [1] (30) [1]
Balance as       $ 5,526 $ 5,495 $ 4,911
Partners' capital |  Non-Controlling Interest—Redeemable Partnership Units held by Brookfield            
Changes in equity [abstract]            
Opening balance (in shares) | shares       121.9 115.8 115.8
Issued for cash (in shares) | shares     6.1 0.0 6.1 0.0
Ending balance (in shares) | shares       121.9 121.9 115.8
Balance as       $ 2,328 $ 2,078 $ 2,078
Unit issuance       0 [1] 250 [1] 0
Balance as       $ 2,328 $ 2,328 $ 2,078
Partners' capital | Non-controlling interest— BIPC exchangeable shares            
Changes in equity [abstract]            
Opening balance (in shares) | shares       0.0 0.0 0.0
Issued for cash (in shares) | shares 5.0          
Non-cash issuance (in shares) | shares       46.3 0.0 0.0
Class A shares of Brookfield Infrastructure Corporation conversion (in shares) | shares       (1.4) 0.0 0.0
Ending balance (in shares) | shares       44.9 0.0 0.0
Balance as       $ 0 $ 0 $ 0
Unit issuance $ 305          
BIPC exchangeable shares conversion       (19) 0 0
Balance as       $ (19) $ 0 $ 0
Partners' capital | Non-controlling interest— Exchange LP Units            
Changes in equity [abstract]            
Opening balance (in shares) | shares       1.2 4.4 0.0
Issued for cash (in shares) | shares   5.7   0.1 0.0 5.7
Exchange LP conversion (in shares) | shares       (0.3) (3.2) (1.3)
Ending balance (in shares) | shares       1.0 1.2 4.4
Balance as       $ 159 $ 212 $ 0
Unit issuance   $ 232   0 0 232
Exchange LP conversion       (3) (53) (20)
Balance as       $ 156 $ 159 $ 212
Preferred Unitholders Capital            
Changes in equity [abstract]            
Opening balance (in shares) | shares       49.9 49.9 32.0
Issued for cash (in shares) | shares       8.0 0.0 18.0
Repurchased and cancelled (in shares) | shares       0.0 0.0 (0.1)
Ending balance (in shares) | shares       57.9 49.9 49.9
Balance as       $ 935 $ 936 $ 595
Unit issuance       195 0 [1] 342 [1]
Unit repurchases [1]         (1) (1)
Repurchased and cancelled       0 (1) (1)
Balance as       $ 1,130 $ 935 $ 936
[1] Refer to Note 26, Partnership Capital.