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REDEEMABLE NONCONTROLLING INTERESTS IN EQUITY OF CONSOLIDATED SUBSIDIARIES - Changes in Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Changes in redeemable noncontrolling interests in equity of consolidated subsidiaries            
Distributions paid to noncontrolling interests $ (8) $ (40) $ (35) $ (37)    
Redeemable noncontrolling interests            
Changes in redeemable noncontrolling interests in equity of consolidated subsidiaries            
Balances at beginning of period    $ 1,506   $ 1,420 $ 1,506 $ 1,420
Net income         80 95
Distributions paid to noncontrolling interests         (52) (72)
Accretion of redeemable noncontrolling interests         3 9
Purchases and sales of businesses and noncontrolling interests, net         24 10
Balances at end of period  $ 1,561   $ 1,462   $ 1,561 $ 1,462