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Acquisitions (Assets Acquired and Liabilities Assumed - BlueLine) (Details) - USD ($)
$ in Millions
1 Months Ended
Oct. 31, 2018
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 5,143 $ 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    
Fair value 230    
Other assets 45    
Total identifiable assets acquired 1,548    
Short-term debt and current maturities of long-term debt (12)    
Current liabilities (135)    
Long-term debt (25)    
Other long-term liabilities (4)    
Total liabilities assumed (176)    
Net identifiable assets acquired 1,372    
Goodwill 697    
Net assets acquired 2,069    
Gross contractual amount 125    
Estimated amount uncollectible 8    
Goodwill, amount expected to be deductible for income tax purposes $ 25    
Customer relationships | BlueLine      
Business Acquisition [Line Items]      
Life (years) 5 years