VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in Valuation and Qualifying Accounts
Balance at Beginning of Period		$ 5
Balance at End of Period		11	$ 5
Allowance for doubtful accounts, deducted from accounts receivable
Changes in Valuation and Qualifying Accounts
Balance at Beginning of Period		21	23	$ 40
Charged to Costs and Expenses		48	62	64
Charged to Other Accounts		0	0	0
Deductions	[1]	39	64	81
Balance at End of Period		30	21	23
Income tax valuation allowance, deducted from deferred tax assets
Changes in Valuation and Qualifying Accounts
Balance at Beginning of Period		3,575	265	291
Charged to Costs and Expenses		306	3,039	0
Charged to Other Accounts		235	271	(10)
Deductions		0	0	16
Balance at End of Period		$ 4,116	$ 3,575	$ 265

[1] Represents principally net amounts charged as uncollectible.