Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Doubtful Accounts Receivable, Current, Beginning Balance $ 117 $ 92 $ 99
Provision for Doubtful Accounts 130 123 73
Other 4 3 (1)
Deductions write-offs (122) (101) (79)
Allowance for Doubtful Accounts Receivable, Current, Ending Balance 129 117 92
Inventory Valuation Reserves 152 151  
Property, Plant and Equipment, Gross 2,806 2,685  
Depreciation 220 211 $ 176
Land      
Property, Plant and Equipment, Gross 128 128  
Building and Improvements      
Property, Plant and Equipment, Gross 1,204 1,194  
Support Equipment      
Property, Plant and Equipment, Gross 1,023 1,302  
Projects in Progress      
Property, Plant and Equipment, Gross 169 61  
Finance lease ROU assets (4)      
Property, Plant and Equipment, Gross $ 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 39 years    
Maximum | Support Equipment      
Property, Plant and Equipment, Useful Life 15 years    
Fair Value Option Securities      
Equity Securities, FV-NI $ 0 $ 0