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CAPITAL MANAGEMENT Changes in Invested Capital (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Changes in Invested capital [Roll Forward]        
Opening balance $ 7,760 $ 6,613 $ 7,599 $ 6,387
Issuance of preferred units 0 0 157 220
Issuance of limited partnership units and redeemable partnership units 4 5 8 11
Ending balance 7,764 6,618 7,764 6,618
Weighted Average Invested Capital $ 7,760 $ 6,613 $ 7,738 $ 6,578