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TRANSFORMATION STRATEGY (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring and Related Activities [Abstract]        
Compensation and benefits $ 41 $ 70 $ 149 $ 262
Total other expenses 22 27 58 98
Total Transformation Strategy Costs 63 97 207 360
Income Tax Benefit from Transformation Strategy Costs (16) (24) (50) (87)
After Tax Transformation Strategy Costs $ 47 $ 73 $ 157 $ 273