Condensed Consolidated Statement of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss) from continuing and discontinued operations	$ 1,466	$ 298	$ 3,340	$ (3,499)
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	(321)	605	(239)	(175)
Pension and postretirement benefit plans adjustments	86	83	190	(2,093)
Change in unrealized cash flow hedging	(167)	154	(139)	(5)
Other comprehensive income (loss), before tax	(402)	842	(188)	(2,273)
Income tax (expense) benefit related to items of other comprehensive income (loss)	18	(54)	(17)	535
Other comprehensive income (loss), net of tax	(384)	788	(205)	(1,738)
Comprehensive income (loss)	1,082	1,086	3,135	(5,237)
Less: Comprehensive income attributable to noncontrolling interest	73	34	162	155
Comprehensive income (loss) attributable to common shareowners	$ 1,009	$ 1,052	$ 2,973	$ (5,392)