INCOME TAXES Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Deferred income tax provision (benefit), net	$ 157	$ 7
Income tax payments, net of refunds	20	29
Estimated reduction of unrecognized tax benefits	10
Investment tax credit	$ 6	$ 0
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	21.00%		35.00%
Tax Cuts and Jobs Act of 2017, Income tax expense benefit, incomplete accounting, provisional amount			$ 1,220
Tax Cuts and Jobs Act of 2017, Income tax expense benefit, incomplete accounting, provisional amount, remeasurement of U.S. deferred taxes			1,454
Tax Cuts and Jobs Act of 2017, Income tax expense benefit, incomplete accounting, provisional amount, transition tax			231
Tax Cuts and Jobs Act of 2017, Change in tax rate, income tax expense benefit, incomplete accounting, provisional amount			1,451
Tax Cuts and Jobs Act of 2017, Increase decrease in valuation allowance for deferred tax assets, incomplete accounting, provisional amount			3
Basis differences related to earnings in Non-U.S. subsidiaries			5,900
Domestic Tax Authority [Member]
Deferred income tax provision (benefit), net			1,451
State and Local Jurisdiction [Member]
Deferred income tax provision (benefit), net			$ 3