Sony has written down $977 million in its movie business, blaming a decline in physical media sales:
In a Monday statement to investors, the company attributed the "downward revision... to a lowering of previous expectations regarding the home entertainment business, mainly driven by an acceleration of market decline." [...] "The decline in the DVD and Blu-ray market was faster than we anticipated," Takashi Iida, a Sony spokesman, told Bloomberg News.
(Score: 2) by Aiwendil on Thursday February 02 2017, @12:24PM
It is close enough (unless you work with it) to think of it as "writing down the premium value", where 'premium' is any non-tangible assets (incl. and future potential earnings), compared to previous estimate.
And, yes, your "writing down 22trillion dollars" has happened, it roughly is the margin of error for the oil reserves of the OOEC-members.