Condensed Consolidated Statement of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss) from continuing and discontinued operations	$ 1,080	$ (3,811)	$ 1,874	$ (3,797)
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	258	665	82	(780)
Pension and postretirement benefit plans adjustments	50	(2,286)	104	(2,176)
Change in unrealized cash flow hedging	88	215	28	(159)
Other comprehensive income (loss), before tax	396	(1,406)	214	(3,115)
Income tax (expense) benefit related to items of other comprehensive income (loss)	(30)	519	(35)	589
Other comprehensive income (loss), net of tax	366	(887)	179	(2,526)
Comprehensive income (loss)	1,446	(4,698)	2,053	(6,323)
Less: Comprehensive income attributable to noncontrolling interest	48	30	89	121
Comprehensive income (loss) attributable to common shareowners	$ 1,398	$ (4,728)	$ 1,964	$ (6,444)