Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v3.20.4
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Doubtful Accounts Receivable, Current, Beginning Balance $ 129 $ 117 $ 92
Charged to expense 92 130 123
Other   4 3
Deductions write-offs (89) (122) (101)
Allowance for Doubtful Accounts Receivable, Current, Ending Balance 132 129 117
Inventory Valuation Reserves 181 152  
Property, Plant and Equipment, Gross 2,989 2,806  
Depreciation 199 220 $ 211
Land      
Property, Plant and Equipment, Gross 133 128  
Building and Improvements      
Property, Plant and Equipment, Gross 1,291 1,204  
Support Equipment      
Property, Plant and Equipment, Gross 1,243 1,023  
Projects in Progress      
Property, Plant and Equipment, Gross 44 169  
Finance lease ROU assets      
Property, Plant and Equipment, Gross $ 278 282  
Minimum | Building and Improvements      
Property, Plant and Equipment, Useful Life 3 years    
Minimum | Support Equipment      
Property, Plant and Equipment, Useful Life 2 years    
Maximum | Building and Improvements      
Property, Plant and Equipment, Useful Life 20 years    
Maximum | Support Equipment      
Property, Plant and Equipment, Useful Life 15 years    
Fair Value Option Securities      
Equity Securities, FV-NI $ 0 $ 0