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CAPITAL MANAGEMENT Changes in Invested Capital (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Changes in Invested capital [Roll Forward] |  |  |  |
Opening balance | $ 8,202 | $ 7,760 | $ 8,156 | $ 7,599
Issuance of preferred units | 0 | 0 | 72 | 157
Issuance of limited partnership units and redeemable partnership units | 2 | 4 | (24) | 8
Ending balance | 8,204 | 7,764 | 8,204 | 7,764
Weighted Average Invested Capital | $ 8,202 | $ 7,760 | $ 8,192 | $ 7,738

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