Financial Instruments - Credit Losses (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Allowance for credit loss	$ 759	$ 745
Trade receivable	20,300
Non-trade receivable	4,200
Investments and Advances
Related Party Transaction [Line Items]
Allowance for credit loss	$ 560	$ 560

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

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant