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INCOME TAXES - Reconciliation of Income Tax Expense with Federal Income Taxes at the Statutory Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	21.00%	35.00%	35.00%
Reconciliation of income tax expense with federal income taxes at the statutory rate
Federal income tax	$ 227	$ 327	$ 357
State income taxes, net of federal income tax benefit	32	20	26
Clean energy credit	(20)	(38)	(29)
Foreign rate difference	20	10	21
Goodwill impairment	20	0	0
U.S. tax legislation impact	0	(3)	0
Excess tax benefits from stock-based compensation	(15)	(14)	0
Other - net	(6)	11	11
Income tax expense	$ 258	$ 313	$ 386
Effective tax rate	23.90%	33.50%	37.90%

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act Of 2017, Amount

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