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CAPITAL MANAGEMENT - Changes in Invested Capital (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in Invested capital [Roll Forward]    
Opening balance $ 8,156 $ 7,599
Issuance of preferred units, net of repurchases 72 341
Issuances of limited partnership units and redeemable partnership units, net of repurchases 781 (16)
Issuance of Exchange LP Units 0 232
Ending balance 9,009 8,156
Weighted Average Invested Capital $ 8,563 $ 7,858