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CAPITAL MANAGEMENT Changes in Invested Capital (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Changes in Invested capital [Roll Forward] |  |  |  |
Opening balance | $ 9,011 | $ 8,202 | $ 9,009 | $ 8,156
Issuance of preferred units | 0 | 0 | 0 | 72
Issuance of limited partnership units and redeemable partnership units | 3 | 2 | 5 | (24)
Ending balance | 9,014 | 8,204 | 9,014 | 8,204
Weighted Average Invested Capital | $ 9,011 | $ 8,202 | $ 9,010 | $ 8,192

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