Table of Contents Also included in 2018 was a decrease in the valuation allowance for a non-U.S. subsidiary of $25 million offset by a charge of $59 million to correct for an error which resulted in an understatement of the valuation allowance offsetting deferred tax assets for prior years. This error had the effect of overstating profit by $17 million for the year ended December 31, 2017. Management has concluded that the error was not material to any period presented. On December 22, 2017, U.S. tax legislation was enacted containing a broad range of tax reform provisions including a corporate tax rate reduction and changes in the U.S. taxation of non-U.S. earnings. In 2018, measurement period adjustments of $104 million reduced the provisionally estimated charge of $2.371 billion recognized during the fourth quarter of 2017. A $154 million benefit revised the estimated impact of the write-down of U.S. net deferred tax assets to reflect the reduction in the U.S. corporate tax rate from 35 percent to 21 percent. This benefit primarily related to the decision to make an additional discretionary pension contribution of $1.0 billion to U.S. pension plans in 2018 which was treated as deductible on the 2017 U.S. tax return. A $50 million charge revised the estimated cost of a mandatory deemed repatriation of non-U.S. earnings, including changes in the deferred tax liability related to the amount of earnings considered not indefinitely reinvested as well as the amount of unrecognized tax benefits and state tax liabilities associated with these tax positions. During 2019, a $178 million tax benefit was recorded to adjust previously unrecognized tax benefits as a result of receipt of additional guidance related to the calculation of the mandatory deemed repatriation of non-U.S. earnings. As a result of U.S. tax reform legislation, distributions of profits from non-U.S. subsidiaries are not expected to cause a significant incremental U.S. tax impact in the future. However, these distributions may be subject to non-U.S. withholding taxes if profits are distributed from certain jurisdictions. Undistributed profits of non-U.S. subsidiaries of approximately $14 billion are considered indefinitely reinvested. Determination of the amount of unrecognized deferred tax liability related to indefinitely reinvested profits is not feasible primarily due to our legal entity structure and the complexity of U.S. and local tax laws. Profit before taxes, as shown above, is based on the location of the entity to which such earnings are attributable. Where an entity’s earnings are subject to taxation, however, may not correlate solely to where an entity is located. Thus, the income tax provision shown below as U.S. or non-U.S. may not correspond to the earnings shown above. The components of profit (loss) before taxes were:  Years ended December 31, (Millions of dollars) 2019 2018 2017 U.S. $ 2,888 $ 2,131 $ 240 Non-U.S. 4,924 5,691 3,842 $ 7,812 $ 7,822 $ 4,082 91