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Credit Losses (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Credit Losses |  |  |
Accounts receivable, net | $ 696 | $ 621 | $ 1,275
Allowance for doubtful accounts | $ 30 | $ 32 | $ 34

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