ACCUMLATED OTHER COMPREHENSIVE LOSS Items Included in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Beginning balance			$ (1,562)
Other comprehensive income (loss) before reclassifications(1)			143
Amounts reclassified from accumulated other comprehensive loss to earnings(1)(2)			129
Total other comprehensive income (loss)	$ 51	$ 42	272	$ 122
Reclassification of certain tax affects due to tax law changes(3)			(253)
Reclassification of accumulated unrealized gains on available-for-sale securities(4)			(9)
Net amounts reclassified from accumulated other comprehensive loss to retained earnings			(262)
Ending balance	(1,552)		(1,552)
Foreign currency translation adjustments
Beginning balance			264
Other comprehensive income (loss) before reclassifications(1)			(16)
Amounts reclassified from accumulated other comprehensive loss to earnings(1)(2)			0
Total other comprehensive income (loss)			(16)
Reclassification of certain tax affects due to tax law changes(3)			0
Reclassification of accumulated unrealized gains on available-for-sale securities(4)			0
Net amounts reclassified from accumulated other comprehensive loss to retained earnings			0
Ending balance	248		248
Actuarial loss | Pension
Beginning balance			(1,802)
Other comprehensive income (loss) before reclassifications(1)			159
Amounts reclassified from accumulated other comprehensive loss to earnings(1)(2)			127
Total other comprehensive income (loss)			286
Reclassification of certain tax affects due to tax law changes(3)			(245)
Reclassification of accumulated unrealized gains on available-for-sale securities(4)			0
Net amounts reclassified from accumulated other comprehensive loss to retained earnings			(245)
Ending balance	(1,761)		(1,761)
Actuarial loss | Other Postretirement Benefits
Beginning balance			(48)
Other comprehensive income (loss) before reclassifications(1)			0
Amounts reclassified from accumulated other comprehensive loss to earnings(1)(2)			5
Total other comprehensive income (loss)			5
Reclassification of certain tax affects due to tax law changes(3)			(12)
Reclassification of accumulated unrealized gains on available-for-sale securities(4)			0
Net amounts reclassified from accumulated other comprehensive loss to retained earnings			(12)
Ending balance	(55)		(55)
Prior service (costs) credits | Pension
Beginning balance			(8)
Other comprehensive income (loss) before reclassifications(1)			0
Amounts reclassified from accumulated other comprehensive loss to earnings(1)(2)			1
Total other comprehensive income (loss)			1
Reclassification of certain tax affects due to tax law changes(3)			(1)
Reclassification of accumulated unrealized gains on available-for-sale securities(4)			0
Net amounts reclassified from accumulated other comprehensive loss to retained earnings			(1)
Ending balance	(8)		(8)
Prior service (costs) credits | Other Postretirement Benefits
Beginning balance			23
Other comprehensive income (loss) before reclassifications(1)			0
Amounts reclassified from accumulated other comprehensive loss to earnings(1)(2)			(4)
Total other comprehensive income (loss)			(4)
Reclassification of certain tax affects due to tax law changes(3)			5
Reclassification of accumulated unrealized gains on available-for-sale securities(4)			0
Net amounts reclassified from accumulated other comprehensive loss to retained earnings			5
Ending balance	24		24
Unrealized gains on available-for-sale securities
Beginning balance			9
Other comprehensive income (loss) before reclassifications(1)			0
Amounts reclassified from accumulated other comprehensive loss to earnings(1)(2)			0
Total other comprehensive income (loss)			0
Reclassification of certain tax affects due to tax law changes(3)			0
Reclassification of accumulated unrealized gains on available-for-sale securities(4)			(9)
Net amounts reclassified from accumulated other comprehensive loss to retained earnings			(9)
Ending balance	$ 0		$ 0