Investments in Affiliates (Schedule of Summarized Income Statement Information for Ibn Sina (National Methanol)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Schedule of Summarized Income Statement Financial Information for Ibn Sina (National Methanol) [Line Items]
Gross Profit	$ 2,682		$ 1,293		$ 1,606
Net earnings (loss)	$ 1,896		$ 1,992		$ 858
National Methanol Company (Ibn Sina) [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Summarized Income Statement Financial Information for Ibn Sina (National Methanol) [Line Items]
Revenues		$ 734		$ 625		$ 726
Gross Profit		272		187		299
Net earnings (loss)		$ 207		$ 118		$ 227