Annual report pursuant to Section 13 and 15(d)

Accounts Receivables (Details)

v3.20.4
Accounts Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]                          
Accounts Receivable, Allowance for Credit Loss   $ 72       $ 47       $ 72 $ 47 $ 52 $ 61
Financing Receivable, Allowance for Credit Loss [Line Items]                          
Provision (benefit) for income taxes   (2) $ 15 $ (48) $ 9 14 $ 21 $ 10 $ 5 (26) 50 61  
Accounts Receivable, Allowance for Credit Loss   72       47       72 47 52 $ 61
Provision for doubtful accounts                   37 16 8  
Accounts Receivable, Allowance for Credit Loss, Writeoff                   (24) (21) $ (17)  
Accounts and Financing Receivable, Allowance for Credit Loss   9               9      
Financing Receivable, Allowance for Credit Loss   4               $ 4      
Minimum                          
Financing Receivable, Allowance for Credit Loss [Line Items]                          
Credit Loss Estimate, Historical Collection Period Measured                   7 years      
Maximum                          
Financing Receivable, Allowance for Credit Loss [Line Items]                          
Credit Loss Estimate, Historical Collection Period Measured                   10 years      
Financing Receivable with Deferred Income Offset [Member]                          
Financing Receivable, Allowance for Credit Loss [Line Items]                          
Financing Receivable, after Allowance for Credit Loss   $ 18               $ 18      
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13                          
Receivables [Abstract]                          
Accounts Receivable, Allowance for Credit Loss $ 10         12         12    
Financing Receivable, Allowance for Credit Loss [Line Items]                          
Provision (benefit) for income taxes 2                        
Accounts Receivable, Allowance for Credit Loss $ 10         $ 12         $ 12