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STOCKHOLDERS' EQUITY - Dividends (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Sep. 24, 2017
Sep. 30, 2018
Sep. 24, 2017
Dividends Payable [Line Items]          
Cash dividends declared, amount   $ 1,200 $ 528 $ 2,346 $ 1,583
Cash dividends declared (in dollars per share)   $ 4.20 $ 1.82 $ 8.20 $ 5.46
Common stock, dividends per share, period increase (decrease) (USD per share)   $ 0.20      
Forecast          
Dividends Payable [Line Items]          
Cash dividends declared, amount $ 569        
Cash dividends declared (in dollars per share) $ 2.20