SHAREHOLDERS' INTEREST - Changes in Amounts Included in Our Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	$ 9,046	$ 8,899
Translation adjustments	26	(54)	$ 32
Reclassification of certain effects due to tax law changes		(253)
Reclassification of accumulated unrealized gains on available-for-sale securities		(9)
Balance at end of year	8,177	9,046	8,899
Pension
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(1,343)	(1,810)	(1,660)
Other comprehensive income (loss) before reclassifications	(216)	388	(282)
Amounts reclassified from accumulated other comprehensive income (loss) to earnings	431	325	132
Total other comprehensive income (loss)	215	713	(150)
Reclassification of certain effects due to tax law changes	0	(246)	0
Balance at end of year	(1,128)	(1,343)	(1,810)
Defined Benefit Plan, Plan Assets, Payment for Settlement	455	200
Other Postretirement Benefits
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(19)	(25)	(38)
Other comprehensive income (loss) before reclassifications	6	13	14
Amounts reclassified from accumulated other comprehensive income (loss) to earnings	1	0	(1)
Total other comprehensive income (loss)	7	13	13
Reclassification of certain effects due to tax law changes	0	(7)	0
Balance at end of year	(12)	(19)	(25)
Translation Adjustment And Other
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	210	273	239
Translation adjustments	26	(54)	34
Total other comprehensive income (loss)	26	(54)	34
Reclassification of accumulated unrealized gains on available-for-sale securities	0	(9)	0
Balance at end of year	236	210	273
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of year	(1,152)	(1,562)	(1,459)
Balance at end of year	$ (904)	$ (1,152)	$ (1,562)