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Financial Instruments - Credit Losses (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Receivables [Abstract]
Allowance for credit loss	$ 699	$ 671
Trade receivable	13,900
Non-trade receivable	3,100
Investments and Advances
Related Party Transaction [Line Items]
Allowance for credit loss	$ 560

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on financing receivable, classified as current.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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