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Accounts Receivable, Net (Allowance for Credit Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 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) | (20) | 47
Write-offs charged against the allowance for expected credit losses | (5) | (2)
Other, net(2) | (1) | 9
Balance as of March 31, | $ 520 | 308
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) |  | $ 38

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