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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.

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