INCOME TAXES - Effective Tax Rate Reconciliation, Amount (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Theoretical income taxes at the U.K. weighted average rate	$ 16	$ 69	$ 81
Income taxed at other rates	10	(42)	(10)
Losses not benefitted	$ 30	$ 9	$ 28
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	1800000000.00%	0.00%	0.00%
Other change in tax reserves	$ 2	$ 17	$ 4
Change in valuation allowances	2	(78)	(12)
Withholding taxes	12	11	11
Change in tax law	0	2	7
Other adjustments	3	3	(3)
Total income tax expense (benefit)	$ 57	$ (9)	$ 106
Effective tax rate	66.00%	(2.00%)	25.00%

Effective Income Tax Rate Reconciliation, Losses Not Benefited

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Effective Income Tax Rate Reconciliation, Other Change In Tax Reserves

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Effective Income Tax Rate Reconciliation, Withholding Taxes, 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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