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Acquisitions (Purchase Price Allocation - BlueLine Acquisition) (Details) - USD ($)
$ in Millions
Oct. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Goodwill   $ 5,154 $ 5,058 $ 4,082 $ 3,260
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 (customer relationships) 230        
Other assets 47        
Total identifiable assets acquired 1,550        
Short-term debt and current maturities of long-term debt (12)        
Current liabilities (140)        
Long-term debt (23)        
Other long-term liabilities (4)        
Total liabilities assumed (179)        
Net identifiable assets acquired 1,371        
Goodwill 698        
Net assets acquired 2,069        
Accounts receivable, gross 125        
Accounts receivable, allowance for doubtful accounts 8        
Goodwill expected to be deductible for tax purposes $ 25        
Customer relationships | BlueLine          
Business Acquisition [Line Items]          
Life (years) 5 years