LEASE COMMITMENTS - LEASE ASSETS AND LIABILITIES (Details) $ in Millions	Dec. 31, 2019 USD ($)
Assets:
Operating lease assets	$ 1,385
Finance lease assets	397
Total lease assets	1,782
Assets and Liabilities, Lessee [Abstract]
Current operating lease liabilities	569
Current finance lease liabilities	51
Non-current operating lease liabilities	854
Non-current finance lease liabilities	347
Total lease liabilities	$ 1,821