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CAPITAL MANAGEMENT Changes in Invested Capital (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Changes in Invested capital [Roll Forward] |  |  |  |
Opening balance | $ 7,760 | $ 6,613 | $ 7,599 | $ 6,387
Issuance of preferred units | 0 | 0 | 157 | 220
Issuance of limited partnership units and redeemable partnership units | 4 | 5 | 8 | 11
Ending balance | 7,764 | 6,618 | 7,764 | 6,618
Weighted Average Invested Capital | $ 7,760 | $ 6,613 | $ 7,738 | $ 6,578

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