In the press release above we refer to free cash flow, which is not defined by U.S. GAAP. We define free cash flow as net cash provided by operating activities less payments for property, plant and equipment, plus proceeds from the sale of and insurance recovery for property, plant and equipment, if applicable. We believe free cash flow to be relevant and useful information to our investors because it provides them with additional information in assessing our liquidity, capital resources and financial operating results. Our management uses free cash flow in evaluating our liquidity, our ability to service debt and our ability to fund capital expenditures. However, free cash flow has certain limitations, including that it does not represent the residual cash flow available for discretionary expenditures since other, non-discretionary expenditures, such as mandatory debt service, are not deducted from the measure. The amount of mandatory versus discretionary expenditures can vary significantly between periods. This measure should be considered in addition to, and not as a substitute for, or superior to, other measures of liquidity or financial performance prepared in accordance with U.S. GAAP, such as net cash provided by operating activities. Furthermore, our definition of free cash flow may not be comparable to similarly titled measures reported by other companies. Below is our reconciliation of free cash flow to U.S. GAAP net cash provided by operating activities.

Non-GAAP Financial Measures Reconciliation:
		2018				2017
Free Cash Flow Data:
Net cash provided by operating activities		$	663			$	618
Less: Purchases of property, plant and equipment		(547		)		(551		)
Plus: Proceeds from sale of and insurance recovery for property, plant and equipment (1)		4				142
Free cash flow		$	120			$	209
(1) Full year 2017 includes proceeds from the sale of our K1 factory in Korea of $128 million.

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