Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common stock and capital in excess of par value	Accumulated other comprehensive income	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Noncontrolling interests
Beginning Balance at Dec. 31, 2019	$ 428,563	$ (388)	$ 35,666	$ (5,243)	$ 402,493	$ (388)	$ (8,125)	$ 3,772
Net earnings (loss)	$ (49,697)				(49,746)			49
Accounting Standards Update [Extensible List]	ASU 2016-13 [Member]
Other comprehensive income, net	$ (1,531)			(1,478)				(53)
Acquisition of common stock	(1,575)						(1,575)
Transactions with noncontrolling interests	(137)		(39)					(98)
Ending Balance at Mar. 31, 2020	375,235		35,627	(6,721)	352,359		(9,700)	3,670
Beginning Balance at Dec. 31, 2019	428,563	$ (388)	35,666	(5,243)	402,493	$ (388)	(8,125)	3,772
Net earnings (loss)	(23,290)
Other comprehensive income, net	(764)
Ending Balance at Jun. 30, 2020	397,253		35,623	(5,967)	378,654		(14,815)	3,758
Beginning Balance at Mar. 31, 2020	375,235		35,627	(6,721)	352,359		(9,700)	3,670
Net earnings (loss)	26,407				26,295			112
Other comprehensive income, net	767			754				13
Acquisition of common stock	(5,115)						(5,115)
Transactions with noncontrolling interests	(41)		(4)					(37)
Ending Balance at Jun. 30, 2020	397,253		35,623	(5,967)	378,654		(14,815)	3,758
Beginning Balance at Dec. 31, 2020	451,336		35,634	(4,243)	444,626		(32,853)	8,172
Net earnings (loss)	11,840				11,711			129
Other comprehensive income, net	(320)			(327)				7
Acquisition of common stock	(6,565)						(6,565)
Transactions with noncontrolling interests	(115)		4					(119)
Ending Balance at Mar. 31, 2021	456,176		35,638	(4,570)	456,337		(39,418)	8,189
Beginning Balance at Dec. 31, 2020	451,336		35,634	(4,243)	444,626		(32,853)	8,172
Net earnings (loss)	40,265
Other comprehensive income, net	38
Ending Balance at Jun. 30, 2021	478,800		35,643	(4,219)	484,431		(45,446)	8,391
Beginning Balance at Mar. 31, 2021	456,176		35,638	(4,570)	456,337		(39,418)	8,189
Net earnings (loss)	28,425				28,094			331
Other comprehensive income, net	358			351				7
Acquisition of common stock	(6,028)						(6,028)
Transactions with noncontrolling interests	(131)		5					(136)
Ending Balance at Jun. 30, 2021	$ 478,800		$ 35,643	$ (4,219)	$ 484,431		$ (45,446)	$ 8,391