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Acquisitions (Assets Acquired and Liabilities Assumed - BlueLine) (Details) - USD ($)
$ in Millions
1 Months Ended
Oct. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 5,121 $ 5,058
BlueLine      
Business Acquisition [Line Items]      
Accounts receivable, net of allowance for doubtful accounts $ 117    
Inventory 7    
Rental equipment 1,078    
Property and equipment 71    
Intangibles 230    
Other assets 41    
Total identifiable assets acquired 1,544    
Short-term debt and current maturities of long-term debt (12)    
Current liabilities (129)    
Deferred taxes (7)    
Long-term debt (25)    
Current long-term liabilities (4)    
Total liabilities assumed (177)    
Net identifiable assets acquired 1,367    
Goodwill 705    
Net assets acquired 2,072    
Gross contractual amount 125    
Goodwill, amount expected to be deductible for income tax purposes $ 25    
Customer relationships | BlueLine      
Business Acquisition [Line Items]      
Life (years) 5 years