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Acquisitions and Joint Ventures Acquisitions and Joint Ventures (Schedule of Business Acquisitions) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 8,060 $ 7,840 $ 5,559
KLX Inc.      
Business Acquisition [Line Items]      
Cash and cash equivalents 225    
Accounts receivable 260    
Inventories 1,298    
Other current assets 43    
Property, plant & equipment 36    
Goodwill 2,056    
Intangible assets 963    
Other assets 78    
Current liabilities (350)    
Other long-term liabilities (113)    
Long-term debt (1,210)    
Total net assets acquired $ 3,286