This excerpt taken from the C 10-Q filed Aug 1, 2008.
Asset-Backed Commercial Paper CDOs (ABCP CDOs)
During the second half of 2007, the market interest rates on commercial paper issued by certain CDO structures increased significantly. To pre-empt the formal exercise of liquidity puts provided by the Company to its CDO structures, the Company purchased all of the outstanding commercial paper issued by these entities, which totaled approximately $25 billion. Because of these purchases, which are deemed to be FIN 46-R reconsideration events, and because the value of the CDOs' commercial paper and subordinated tranches were deteriorating as the underlying collateral of the CDOs (primarily residential mortgage-backed securities) was being downgraded, the Company concluded that it was the primary beneficiary of these entities and began consolidating them in the fourth quarter of 2007.
Upon consolidation, the Company reflected the underlying assets of the CDOs on its balance sheet in Trading account assets at fair value, eliminated the commercial paper assets previously recognized, and recognized the subordinate CDO liabilities (owned by third parties) at fair value. This resulted in a balance sheet gross-up of approximately $400 million as of December 31, 2007 compared to the prior accounting treatment as unconsolidated VIEs.
During the second quarter of 2008 and the fourth quarter of 2007, the Company recognized pretax losses of $2.0 billion and $4.3 billion, respectively, for changes in the fair value of the consolidated CPCDOs' assets.