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CAPITAL MANAGEMENT Changes in Invested Capital (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Changes in Invested capital [Roll Forward]        
Opening balance $ 9,011 $ 8,202 $ 9,009 $ 8,156
Issuance of preferred units 0 0 0 72
Issuance of limited partnership units and redeemable partnership units 3 2 5 (24)
Ending balance 9,014 8,204 9,014 8,204
Weighted Average Invested Capital $ 9,011 $ 8,202 $ 9,010 $ 8,192