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CAPITAL MANAGEMENT Changes in Invested Capital (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Changes in Invested capital [Roll Forward] |  |
Opening balance | $ 7,599 | $ 6,387
Issuance of preferred units, net of repurchases | 341 | 220
Repurchases of limited partnership units and redeemable partnership units, net of issuances | (16) | 992
Exchange LP unit conversion, value | 232 | 0
Ending balance | 8,156 | 7,599
Weighted Average Invested Capital | $ 7,858 | $ 6,885

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