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, 2018	$ 352,500		$ 35,715	$ (5,015)	$ 321,112		$ (3,109)	$ 3,797
Net earnings (loss)	21,732				21,661			71
Other comprehensive income, net	310			288				22
Issuance (acquisition) of common stock	(1,677)		13				(1,690)
Transactions with noncontrolling interests	(274)		(98)					(176)
Ending Balance at Mar. 31, 2019	372,591		35,630	(4,727)	342,773		(4,799)	3,714
Beginning Balance at Dec. 31, 2018	352,500		35,715	(5,015)	321,112		(3,109)	3,797
Net earnings (loss)	35,905
Other comprehensive income, net	355
Ending Balance at Jun. 30, 2019	386,391		35,618	(4,678)	356,846		(5,242)	3,847
Beginning Balance at Mar. 31, 2019	372,591		35,630	(4,727)	342,773		(4,799)	3,714
Net earnings (loss)	14,173				14,073			100
Other comprehensive income, net	45			49				(4)
Issuance (acquisition) of common stock	(435)		8				(443)
Transactions with noncontrolling interests	17		(20)					37
Ending Balance at Jun. 30, 2019	386,391		35,618	(4,678)	356,846		(5,242)	3,847
Beginning Balance at Dec. 31, 2019	$ 428,563	$ (388)	35,666	(5,243)	402,493	$ (388)	(8,125)	3,772
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Net earnings (loss)	$ (49,697)				(49,746)			49
Other comprehensive income, net	(1,531)			(1,478)				(53)
Issuance (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
Issuance (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