OTHER COMPREHENSIVE INCOME Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period			$ (4,342)
Amounts reclassified from accumulated other comprehensive income	$ 67	$ 49	276	$ 154
Balance at end of period	(3,314)	(5,132)	(3,314)	(5,132)
Defined Benefit Pension and Postretirement Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(1,809)	(2,192)	(1,880)	(2,277)
Other comprehensive income (loss) before reclassifications	831	0	832
Amounts reclassified from accumulated other comprehensive income	31	43	101	128
Balance at end of period	(947)	(2,149)	(947)	(2,149)
Change in Cumulative Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(2,286)	(2,950)	(2,457)	(2,465)
Other comprehensive income (loss) before reclassifications	(114)	(28)	(85)	(515)
Amounts reclassified from accumulated other comprehensive income	44	0	184	0
Other comprehensive income (loss) attributable to noncontrolling interest	0	0	2	2
Balance at end of period	(2,356)	(2,978)	(2,356)	(2,978)
Net Gains and Losses on Cash Flow Hedging Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	1	(7)	(5)	3
Other comprehensive income (loss) before reclassifications	(4)	(4)	3	(34)
Amounts reclassified from accumulated other comprehensive income	(8)	6	(9)	26
Balance at end of period	$ (11)	$ (5)	$ (11)	$ (5)