Investments In And Advances To Affiliates (Combined Balance Sheets And Statements Of Earnings Of The Company's Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Combined balance sheets and statements of earnings of the Company's unconsolidated affiliates:
Current assets	$ 27,286				$ 21,347				$ 27,286	$ 21,347
Current liabilities	(18,182)				(13,734)				(18,182)	(13,734)
Non-current liabilities	(11,441)				(10,980)				(11,441)	(10,980)
Revenues	17,978	$ 15,126	$ 16,281	$ 14,970	16,329	$ 16,726	$ 16,297	$ 15,304	64,355	64,656	$ 64,341
Gross Profit	1,352	$ 1,042	$ 1,108	$ 951	1,169	$ 1,078	$ 972	$ 928	4,453	4,147	4,181
Net earnings including noncontrolling interests									1,782	1,379	1,815
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Combined balance sheets and statements of earnings of the Company's unconsolidated affiliates:
Current assets	29,508				26,695				29,508	26,695
Non-current assets	23,853				22,627				23,853	22,627
Current liabilities	(25,969)				(23,580)				(25,969)	(23,580)
Non-current liabilities	(7,191)				(5,913)				(7,191)	(5,913)
Noncontrolling interests	(1,075)				(1,066)				(1,075)	(1,066)
Net assets	$ 19,126				$ 18,763				19,126	18,763
Revenues									59,195	50,596	53,143
Gross Profit									5,070	5,334	5,118
Net earnings including noncontrolling interests									$ 2,093	$ 1,455	$ 1,881