Schedule - VALUATION AND QUALIFYING ACCOUNTS (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Losses on Receivables
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 8	$ 43	$ 13
Charged to Costs and Expenses	1	5	32
Charged to Other Accounts	0	0	0
Deductions from Reserves	0	40	2
Ending Balance	9	8	43
Deferred Income Tax Valuation
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	5,450	1,578	1,416
Charged to Costs and Expenses	1,214	3,962	280
Charged to Other Accounts	0	0	0
Deductions from Reserves	1,465	90	118
Ending Balance	$ 5,199	$ 5,450	$ 1,578