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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