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Property, Plant and Equipment Property, Plant and Equipment - (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Land $ 426   $ 427
Buildings 2,658   2,593
Machinery and equipment 13,654   13,483
Construction in progress 682   655
Property, plant, and equipment and finance lease right-of-use asset, gross 17,420    
Property, plant and equipment, gross     17,158
Accumulated depreciation (10,488)    
Accumulated depreciation     (10,161)
Property plant and equipment, net before spare parts 6,932   6,997
Spare parts 276   262
Property, plant and equipment, net 7,208    
Property, plant and equipment, net   $ 7,243 7,259
Owned      
Property, Plant and Equipment [Line Items]      
Land 425   427
Buildings 2,431   2,564
Machinery and equipment 13,624   13,440
Construction in progress 681   654
Property, plant, and equipment and finance lease right-of-use asset, gross 17,161    
Property, plant and equipment, gross     17,085
Accumulated depreciation (10,438)    
Accumulated depreciation     (10,128)
Property plant and equipment, net before spare parts 6,723   6,957
Spare parts 276   262
Property, plant and equipment, net 6,999    
Property, plant and equipment, net     7,219
Finance Leases      
Property, Plant and Equipment [Line Items]      
Land 1    
Buildings 227    
Machinery and equipment 30    
Construction in progress 1    
Property, plant, and equipment and finance lease right-of-use asset, gross 259    
Accumulated depreciation (50)    
Property plant and equipment, net before spare parts 209    
Spare parts 0    
Property, plant and equipment, net $ 209    
Capital Leases      
Property, Plant and Equipment [Line Items]      
Land     0
Buildings     29
Machinery and equipment     43
Construction in progress     1
Property, plant and equipment, gross     73
Accumulated depreciation     (33)
Property plant and equipment, net before spare parts     40
Spare parts     0
Property, plant and equipment, net     $ 40
Building and Building Improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 3 years    
Building and Building Improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 45 years    
Machinery and Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 3 years    
Machinery and Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life 40 years