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CAPITAL MANAGEMENT - Changes in Invested Capital (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes in Invested capital [Roll Forward]    
Opening balance $ 9,213 $ 9,009
Net issuance of preferred units 8 195
Issuance of limited partnership and redeemable partnership units 945 9
Issuance of BIPC exchangeable shares 1,770 0
Issuance of BIPC exchange LP Units 259 0
Ending balance 12,195 9,213
Weighted Average Invested Capital $ 10,076 $ 9,067