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ASSETS HELD FOR SALE - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Assets And Liabilities Held For Sale [Line Items]            
Gain on dispositions     $ 522 $ 90 $ 520 $ 106
Disposal group, disposed of by sale, not discontinued operations | Business services | Facilities Management            
Disclosure Of Assets And Liabilities Held For Sale [Line Items]            
Consideration received $ 1,000          
Gain on dispositions $ 341          
Disposal group, disposed of by sale, not discontinued operations | Business services | Executive relocation            
Disclosure Of Assets And Liabilities Held For Sale [Line Items]            
Gain on dispositions   $ 180        
Proceeds from sale   $ 230