This excerpt taken from the C 10-K filed Feb 24, 2006.
FASB Pension Project
The FASB is currently working on a project that will change the way pension and postretirement plan obligations are displayed on the Consolidated Balance Sheet.
Citigroup expects the standard to require companies to record an asset or liability on the Consolidated Balance Sheet equal to the funded status of the plans. Any other plan assets or liabilities would be reflected net as an adjustment to stockholders' equity.