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CAPITAL MANAGEMENT - Changes in Invested Capital (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in Invested capital [Roll Forward]    
Opening balance $ 9,009 $ 8,156
Issuance of preferred units and preferred shares, net of repurchases 195 [1] 72
Issuances of limited partnership units and redeemable partnership units, net of repurchases 9 781
Ending balance 9,213 9,009
Weighted Average Invested Capital $ 9,067 $ 8,563
[1] Refer to Note 26, Partnership Capital.