ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in Amounts Included in Our Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period			$ 8,177
Translation adjustments	$ 17	$ 11	(25)	$ 25
Total other comprehensive income	41	39	44	397
Balance at end of period	8,202	8,724	8,202	8,724
Pension
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(1,084)	(1,000)	(1,128)	(1,343)
Other comprehensive income (loss) before reclassifications	0	10	20	(14)
Amounts reclassified from accumulated other comprehensive loss to earnings	24	18	48	385
Total other comprehensive income	24	28	68	371
Balance at end of period	(1,060)	(972)	(1,060)	(972)
Other Postretirement Benefits
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(11)	(18)	(12)	(19)
Amounts reclassified from accumulated other comprehensive loss to earnings	0	0	1	1
Total other comprehensive income	0	0	1	1
Balance at end of period	(11)	(18)	(11)	(18)
Translation Adjustment And Other
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	194	224	236	210
Translation adjustments	17	11	(25)	25
Total other comprehensive income	17	11	(25)	25
Balance at end of period	211	235	211	235
Accumulated other comprehensive loss:
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(901)	(794)	(904)	(1,152)
Balance at end of period	$ (860)	$ (755)	$ (860)	$ (755)