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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