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LEASE COMMITMENTS - OTHER INFORMATION (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Amortization of ROU assets $ 29 $ 19
Interest on lease liabilities 14 2
Total lease cost 904 953
Short-term lease cost 207 404
Variable lease cost 95 162
Operating cash flows 506 262
Investing cash flows 89 112
Financing cash flows 29 19
Finance lease 358  
Failed Sale-Leaseback    
Lessee, Lease, Description [Line Items]    
Finance lease 300 300
Property, plant and equipment, net    
Lessee, Lease, Description [Line Items]    
Operating lease costs 197 449
Operating expense and cost of sales    
Lessee, Lease, Description [Line Items]    
Operating lease costs 557 391
Selling, general and administrative expenses    
Lessee, Lease, Description [Line Items]    
Operating lease costs $ 107 $ 92