This excerpt taken from the C 10-K filed Feb 26, 2010.
Liquidity Gaps and Limits
Citigroup uses a monitoring tool that measures potential funding gaps over various time horizons in a standard operating environment. The gap for any given funding need represents the potential market access required, or placements to the market (internal or external) over designated tenors. Limits establish risk appetite for potential market access in standard operating conditions and are monitored against the liquidity position on a daily basis. Limits are established based on evaluation of available contingent actions and liquidity vulnerabilities under designated stress scenarios. While the contingent capacity places a cap on the limits, the limits are also evaluated based on the structural liquidity of the balance sheet, stability of liabilities, liquidity of assets, depth of markets, the experience of management, size of the balance sheet, historical utilization, and an evaluation of expected business and funding strategy. Limits are established such that in stress scenarios, entities are self-funded or net providers of liquidity. Thus, the risk tolerance for liquidity funding gaps is limited based on the capacity to cover the position in a stressed environment. These limits are the key daily risk-management tool for Citigroup, the parent holding company, and its banking subsidiaries.