ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Amounts Included in Our Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period			$ 10,767
Translation adjustments	$ (25)	$ 15	(9)	$ 24
Total other comprehensive income	52	136	81	166
Balance at end of period	10,816	10,400	10,816	10,400
Pension
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(709)	(1,044)	(720)	(1,064)
Other comprehensive income (loss) before reclassifications	59	100	51	96
Amounts reclassified from accumulated other comprehensive loss to earnings	18	20	37	44
Total other comprehensive income	77	120	88	140
Balance at end of period	(632)	(924)	(632)	(924)
Other Post-Employment Benefits
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	0	(11)	(2)	(12)
Other comprehensive income (loss) before reclassifications	(1)	0	0	0
Amounts reclassified from accumulated other comprehensive loss to earnings	1	1	2	2
Total other comprehensive income	0	1	2	2
Balance at end of period	0	(10)	0	(10)
Translation Adjustments and Other
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	259	263	243	254
Translation adjustments	(25)	15	(9)	24
Total other comprehensive income	(25)	15	(9)	24
Balance at end of period	234	278	234	278
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(450)	(792)	(479)	(822)
Total other comprehensive income	52	136	81	166
Balance at end of period	$ (398)	$ (656)	$ (398)	$ (656)