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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Change in Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Reconciliation of changes in associates and joint ventures          
Balance at beginning of year     $ 4,967 $ 4,591 $ 4,591
Share of earnings for the year $ 11 $ 34 59 $ 52 224
Foreign currency translation and other     (590)   (62)
Share of other comprehensive income from associates and joint ventures, other than foreign exchange differences     33   54
Distributions     (131)   (254)
Disposition of interest     0   (135)
Investments Reclassified as Held for Sale     2   38
Acquisitions     0   587
Balance at end of year $ 4,336   $ 4,336   $ 4,967