Investments, Loans and Long-Term Receivables (Summarized Financial Information for Equity Method Investments in Affiliated Companies) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Revenues	$ 48,349	$ 19,256	$ 36,670
Net income	8,079	(2,655)	7,257
Current assets	16,050	12,066
Current liabilities	12,021	5,366
Affiliated Companies [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	11,824	7,931	11,310
Income before income taxes	3,946	1,843	3,726
Net income	2,557	1,426	$ 3,085
Current assets	4,493	2,579
Noncurrent assets	36,602	35,257
Current liabilities	3,498	2,110
Noncurrent liabilities	$ 17,465	$ 18,099