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Accounts Receivable, Net (Allowance for Credit Loss) (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 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) | (32) | 263
Write-offs charged against the allowance for expected credit losses | (15) | (5)
Other, net(2) | (4) | 18
Balance as of September 30 | $ 495 | 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, net of recoveries (1) |  | $ 223

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