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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of income tax expense with federal income taxes at the statutory rate
Federal income tax	$ 199	$ 254	$ 227
State income taxes, net of federal income tax benefit	33	36	32
Clean energy credit	0	0	(20)
Foreign rate difference	23	25	20
Foreign subsidiaries tax impacts due to divestiture	(61)	0	20
U.S. tax legislation impact	16	11	4
Excess tax benefits from stock-based compensation	(4)	(2)	(15)
Other - net	(14)	(10)	(10)
Income tax expense	$ 192	$ 314	$ 258
Effective tax rate	20.30%	26.00%	23.90%

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Effective Income Tax Rate Reconciliation, Disposition of Business, Foreign Subsidiaries, Amount

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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