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INCOME TAXES (Reserve for unrecognized tax benefits, interest and penalties) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 390	$ 101	$ 110
Additions:
Prior year tax positions	100	302	5
Current year tax positions	14	6	28
Decreases:
Prior year tax positions	(86)	(1)	(3)
Settlements with taxing authorities	(9)	(17)	0
Lapse of statute of limitations	(5)	(1)	(39)
Balance at end of year	$ 404	$ 390	$ 101

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Unrecognized Tax Benefits, Additions

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Unrecognized Tax Benefits, Decreases

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Amount of unrecognized tax benefits.

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