SCHEDULE 13G

EXHIBIT B

JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

The undersigned persons hereby agree that reports on Schedule 13G, and amendments thereto, with respect to the Common Stock of Ameriprise Financial, Inc. may be filed in a single statement on behalf of each of such persons, and further, each of such persons designates Warren E. Buffett as its agent and Attorney-in-Fact for the purpose of executing any and all Schedule 13G filings required to be made by it with the Securities and Exchange Commission.

Dated: February 14, 2007	/S/ Warren E. Buffett
	Warren E. Buffett
	Berkshire Hathaway Inc.
Dated: February 14, 2007	/S/ Warren E. Buffett
	By: Warren E. Buffett
	Title: Chairman of the Board
	OBH, Inc.
Dated: February 14, 2007	/S/ Warren E. Buffett
	By: Warren E. Buffett
	Title: Chairman of the Board
	National Indemnity Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Chairman of the Board
	National Fire & Marine Insurance Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Chairman of the Board
	Nebraska Furniture Mart, Inc.
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary
	Borsheim’s Jewelry Company, Inc.
Dated: February 14, 2007	/S/ Warren E. Buffett
	By: Warren E. Buffett
	Title: Chairman of the Board

	The Fechheimer Brothers Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary
	Columbia Insurance Company
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Chairman of the Board
	Blue Chip Stamps
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary
	Wesco Holdings Midwest, Inc.
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Assistant Secretary
	Wesco Financial Corporation
Dated: February 14, 2007	/S/ Jeffrey L. Jacobson
	By: Jeffrey L. Jacobson
	Title: Vice President
	Wesco-Financial Insurance Co.
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Chairman of the Board
	Central States of Omaha Companies, Inc.
Dated: February 14, 2007	/S/ John E. Kizer
	By: John E. Kizer
	Title: President
	Central States Indemnity Company of Omaha
Dated: February 14, 2007	/S/ John E. Kizer
	By: John E. Kizer
	Title: President

	FlightSafety International, Inc.
Dated: February 14, 2007	/S/ Marc D. Hamburg
	By: Marc D. Hamburg
	Title: Director