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INCOME TAXES - Foreign Earnings (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Examination      
Accumulated undistributed profits of non-U.S. subsidiaries considered indefinitely reinvested $ 47,000    
Additional tax liability to be provided should be undistributed earnings of foreign subsidiaries which were indefinitely invested were remitted currently 13,100    
Total bad debt reserved not included in deferred tax liabilities calculation 358    
Deferred tax liabilities not recognized relating to bad debt reserved 125    
In offices outside the U.S.      
Income Tax Examination      
Pretax earnings $ 11,600 $ 11,300 $ 10,100