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CAPITAL MANAGEMENT Changes in Invested Capital (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Changes in Invested capital [Roll Forward] |  |  |  |
Opening balance | $ 9,410 | $ 9,011 | $ 9,213 | $ 9,009
Issuance of preferred units | 0 | 0 | 194 | 0
Issuance of limited partnership units and redeemable partnership units | 3 | 3 | 6 | 5
Ending balance | 9,413 | 9,014 | 9,413 | 9,014
Weighted Average Invested Capital | $ 9,410 | $ 9,011 | $ 9,386 | $ 9,010

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