I would advise you not to quibble about the semantics of "liabilities" versus "debts", especially since your rent "liability" example was the precursor to the discussion.
With that being said, a pension obligation is a legitimate obligation that must be accounted for in the present. The City of Chicago has essentially entered into an employment contract whereby the employee performs work for some amount of present wage plus some additional amount of deferred compensation (the pension). Presumably, had the employer not offered the deferred compensation the employee would have required a greater amount of immediate compensation. In that regard then the temporality of the payment is irrelevant; the fact that the employee fulfilled their end of the agreement by performing the work means that the employer is required to fulfill their part by making the deferred payment.
Now, a portion of those future deferred payments may be attributed to work not yet completed (i.e. general labor in 2012). There is certainly a case to be made that those expenses should not be counted as they have not yet been incurred. The counterpoint is that they are likely to be incurred: the odds of the City of Chicago ceasing to exist in 2012 are slim. From a GAAP standpoint that counterpoint may not be completely persuasive, but from a Gov't and managerial accounting standpoint it certainly is.
You're right that my rent example was a bad one. What I was trying to illustrate is that debts far off in the future are not the same as debts that we need to deal with today. If you owe someone $65,000 over the next 30 years, that's a lot different than owing them $65,000 today.
Anyways, point well taken.
