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STOCKHOLDERS' EQUITY - Repurchases of Common Stock (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 25, 2018
Dec. 31, 2018
Shareholders Equity [Line Items]      
Common stock repurchased (in shares) 1.0    
Reduction to stockholders' equity due to repurchases of common stock $ 284 $ 300  
Total remaining authorization for future common share repurchases $ 2,700    
Par value of shares repurchased (in dollars per share) $ 1   $ 1
Additional paid-in capital after reduction $ 0   $ 0
Reduction to retained earnings      
Shareholders Equity [Line Items]      
Reduction to stockholders' equity due to repurchases of common stock $ 237 $ 274