Even so, the SEC's complaint offers the clearest picture yet of some of the methods allegedly used by Ghosn, Kelly, and Nissan to hide compensation and payments made to the fallen auto titan. Here are some of key details:

Disclosure Rules Changes

Because of an impending change in Japan's disclosure rules in 2009 for corporate directors, "Ghosn became concerned about criticism that might result in the Japanese and French media if his total compensation became publicly known," the SEC said.

Every year from 2011, a senior employee "would prepare for Ghosn's approval a document summarizing Ghosn's total fixed compensation, his paid compensation that was being disclosed, and his remaining compensation that was not paid and was not being disclosed," the complaint said. About $94 million of Ghosn's undisclosed compensation was determined in this manner, the agency said.

Payout Methods

In order to pay out the undisclosed compensation, "Ghosn and his subordinates sought multiple ways to pay his undisclosed compensation through Nissan-related entities without disclosure," the complaint said. While they considered paying this out using Nissan subsidiaries, they instead decided to postpone the payments for a later undisclosed date, according to the agency.

The total remuneration, paid remuneration, and postponed remuneration were tracked each year in a spreadsheet, according to the SEC. A Nissan employee "showed or provided to Ghosn the reports he prepared each fiscal year to set Ghosn's total, paid, and postponed compensation, as well as the spreadsheets he maintained and updated each year that tracked the same information," the complaint said.

Another plan to pay out the undisclosed compensation emerged in 2013, when Ghosn and his subordinates sought to use Nissan's long-term incentive plan (LTIP) to release cash to the former CEO, according to the SEC. Although Ghosn hadn't participated previously in the incentive plan, an employee of the automaker prepared backdated letters that granted Ghosn compensation under the plan for the amount of undisclosed agreed-upon compensation.

"The backdated LTIP award letters were intended to ensure Ghosn would receive payment on the postponed compensation that had been omitted from Nissan's director compensation disclosures," the complaint said. The funding for the plan's payments came from a pool of money called the CEO Reserve, and in order for the CFO to sign off on the payments, he was "falsely told that the LTIP awards were a broad-based grant to numerous Nissan participants rather than that the vast majority was for Ghosn and included exchange rate protection on the inflated retirement allowance," the document said.

Boosted Retirement Allowance

Separately, Ghosn used another method to increase his compensation: boosting his retirement allowance by more than $50 million, according to the SEC. Ghosn and his subordinates backdated retirement award letters in order to increase his compensation, and then sought to make the changes in the accounting record, the agency said. Because the increase in retirement would have to be made public, they decided to make the changes by saying it was a miscalculation, the SEC said.

"Sometime afterward, Ghosn's subordinates, including Kelly, took steps to have Nissan's finance department record the pension increase in Nissan's accounting systems, including by falsely informing Nissan's CFO that the increase was the result of a mistake at the Secretariat's Office," the complaint said.

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