Citigroup's top two officers, Sanford I. Weill and John S. Reed, put down on paper this week what they had previously been practicing in the way of dividing their responsibilities.

Mr. Weill and Mr. Reed, co-chairmen and co-chief executive officers since last year's merger of Travelers Group and Citicorp, did almost everything as a pair during the early stages of their partnership. They sought to show shareholders and Wall Street that a deal between two such different companies could succeed and that their co-leadership approach would work and thrive.

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