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Accounts Receivable, Net (Allowance for Credit Loss) (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Balance as of December 31, 2019 | $ 254
Current period provision for expected credit losses(1) | 263
Write-offs charged against the allowance for expected credit losses | (5)
Other, net(2) | 18
Balance as of September 30, 2020 | 530
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(1) | $ 223

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