Financial Instruments - Credit Losses (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Allowance for credit loss	$ 745	$ 671
Trade receivable	16,400
Non-Trade Accounts Receivable
Related Party Transaction [Line Items]
Non-trade receivable	3,400
Equity Affiliate Loan \| Investments and Advances
Related Party Transaction [Line Items]
Allowance for credit loss	$ 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