ACCUMLATED OTHER COMPREHENSIVE LOSS Items Included in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Beginning balance	$ (1,152)
Total other comprehensive income (loss)	358	$ 38
Reclassification of certain tax affects due to tax law changes		253
Reclassification of accumulated unrealized gains on available-for-sale securities		(9)
Ending balance	(794)	(1,786)
Pension
Beginning balance	(1,343)	(1,810)
Other comprehensive income (loss) before reclassifications	(24)	8
Amounts reclassified from accumulated other comprehensive loss to earnings	367	46
Total other comprehensive income (loss)	343	54
Reclassification of certain tax affects due to tax law changes	0	(246)
Ending balance	(1,000)	(2,002)
Other Postretirement Benefits
Beginning balance	(19)	(25)
Amounts reclassified from accumulated other comprehensive loss to earnings	1	(1)
Total other comprehensive income (loss)	1	(1)
Reclassification of certain tax affects due to tax law changes	0	(7)
Ending balance	(18)	(33)
Translation Adjustment And Other
Beginning balance	210	273
Total other comprehensive income (loss)	14	(15)
Translation adjustments before reclassifications	14	(15)
Reclassification of accumulated unrealized gains on available-for-sale securities	0	(9)
Ending balance	$ 224	$ 249