Table:
|  |  |  | As of December 31, |  |  |
| --- | --- | --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 | 2016 | 2015 |
|  |  |  | (Dollars in millions) |  |  |
| Net property, plant and equipment(1) | $26,079 | 26,408 | 26,852 | 17,039 | 18,069 |
| Goodwill(1)(2) | 21,534 | 28,031 | 30,475 | 19,650 | 20,742 |
| Total assets(3)(4) | 64,742 | 70,256 | 75,611 | 47,017 | 47,604 |
| Total long-term debt(3)(5) | 34,694 | 36,061 | 37,726 | 19,993 | 20,225 |
| Total stockholders’ equity | 13,470 | 19,828 | 23,491 | 13,399 | 14,060 |
Paragraphs:
Selected financial information from our consolidated balance sheets is as follows:
(1) During 2016, as a result of our then pending sale of a portion of our colocation business and data centers, we reclassified $1.1 billion in net property, plant and equipment and $1.1 billion of goodwill to assets held for sale which is included in other current assets on our consolidated balance sheet. See Note 3—Sale of Data Centers and Colocation Business to our consolidated financial statements in Item 8 of Part II of this report, for additional information.
(2) During 2019 and 2018, we recorded non-cash, non-tax-deductible goodwill impairment charges of $6.5 billion and $2.7 billion, respectively.
(3) In 2015, we adopted both ASU 2015-03 “Simplifying the Presentation of Debt Issuance Costs” and ASU 2015-17 “Balance Sheet Classification of Deferred Taxes” by retrospectively applying the requirements of the ASUs to our previously issued consolidated financial statements.
(4) In 2019, we adopted ASU 2016-02 “Leases (ASC 842)” by using the non-comparative transition option pursuant to ASU 2018-11. Therefore, we have not restated comparative period financial information for the effects of ASC 842.
(5) Total long-term debt includes current maturities of long-term debt and finance lease obligations of $305 million for the year ended December 31, 2016 associated with assets held for sale. For additional information on our total long-term debt, see Note 7— Long-Term Debt and Credit Facilities to our consolidated financial statements in Item 8 of Part II of this report. For total contractual obligations, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Future Contractual Obligations” in Item 7 of Part II of this report.
Question:
Regarding the total assets, what was adopted in 2019?
Answer: ASU 2016-02 “Leases (ASC 842)” by using the non-comparative transition option pursuant to ASU 2018-11