This excerpt taken from the UNH 10-K filed Feb 11, 2009.
FUNDING OF PLAN
9.1. Unfunded Plan. The obligation of UnitedHealth Group to make payments under the Plan constitutes only the unsecured (but legally enforceable) promises of UnitedHealth Group to make such payments. No Participant shall have any lien, prior claim or other security interest in any property of UnitedHealth Group. UnitedHealth Group shall have no obligation to establish or maintain any fund, trust or account (other than a bookkeeping account) for the purpose of funding or paying the benefits promised under the Plan. If such a fund, trust or account is established, the property therein shall remain the sole and exclusive property of UnitedHealth Group. UnitedHealth Group shall be obligated to pay the cost of the Plan out of its general assets. All references to accounts, accruals, gains, losses, income, expenses, payments, custodial funds and the like are included merely for the purpose of measuring the obligation of UnitedHealth Group to Participants in the Plan and shall not be construed to impose on UnitedHealth Group the obligation to create any separate fund for purposes of the Plan.
9.2. Corporate Obligation. Neither any officer of UnitedHealth Group nor any member of the Committee in any way secures or guarantees the payment of any benefit or amount which may become due and payable hereunder to or with respect to any Participant. Each Participant and other person entitled at any time to payments hereunder shall look solely to the assets of UnitedHealth Group for such payments as an unsecured, general creditor. After benefits have been paid to or with respect to a Participant and such payment purports to cover in full the benefit hereunder, such former Participant or other person or persons, as the case may be, shall have no further right or interest in any other Plan assets. No person shall be under any liability or responsibility for failure to effect any of the objectives or purposes of this Plan by reason of the insolvency of UnitedHealth Group.