Japan-Based SoftBank Group Corp Posted 9 Months Ended Dec 2017 Net Income Attributable to Owners of the Parent of US$6.2 Bil Just From the Puzzling, Very Lucrative US Federal Income Tax Debt Forgiveness Feature in the US Trump Tax Cuts Act

Here's the relevant part of SoftBank Group's Nine Months Ended Dec 2017 Financial Statements from Its Investor Relations Website: 

SoftBank Group Corp. Consolidated Financial Report For the nine-month period ended December 31, 2017 (IFRS)

1. Results of Operations (1) Overview of Results of Operations 1. Sales and income increased yoy Net sales increased 3.5% - Sales increased in all segments Operating income increased 23.6% - Income from SoftBank Vision Fund and Delta Fund of ¥236.4 billion - Sprint’s operating income surged Net income attributable to owners of the parent increased 20.0% - U.S. tax reform boosted Sprint’s income by ¥687.7 billion


"(q) Net Income Attributable to Owners of the Parent After deducting net income attributable to non-controlling interests such as those of Sprint and Yahoo Japan Corporation from (p), net income attributable to owners of the parent increased by ¥169,171 million (20.0%) year on year to ¥1,014,944 million. Of Sprint’s decrease in income taxes of ¥818,342 million described in (m), ¥687,744 million was included in net income attributable to owners of the parent, corresponding to SoftBank Group Corp.’s 84.04% ownership stake in Sprint."