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CAPITAL MANAGEMENT Changes in Invested Capital (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in Invested capital [Roll Forward] |  |  |
Opening balance | $ 6,387 | $ 5,452 |
Issuance of preferred units | 220 | 186 | $ 189
Issuance of limited partnership units and redeemable partnership units | 992 | 749 |
Ending balance | 7,599 | 6,387 | $ 5,452
Weighted Average Invested Capital | $ 6,885 | $ 5,592 |

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