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Accounts Receivable, Net (Allowance for Credit Loss) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance as of January 1 $ 546 $ 254
Current period provision for expected credit losses, net of recoveries (1) (16) 225
Write-offs charged against the allowance for expected credit losses (11) (3)
Other, net(2) 0 18
Balance as of June 30 $ 519 494
ASU 2016-13 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Other, net(2)   (34)
COVID-19 [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current period provision for expected credit losses, net of recoveries (1)   $ (194)