Berkshire Hathaway reports the following footnotes with its \(10-\mathrm{K}\) report.

a. At what amount does Berkshire Hathaway report its equity securities investment portfolio on its balance sheet? Does that amount include any unrealized gains or losses? Explain.

b. How is Berkshire Hathaway accounting for its equity securities investment portfolio-as an available-for-sale or trading portfolio? How do you know?

c. What does the number \(\$ 2,523\) represent in the Accumulated Other Comprehensive Income footnote? Is this number pretax or after-tax? Explain.

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Years Ended December 31 ($ millions) Accumulated Other Comprehensive Income Unrealized appreciation of Investments.... Applicable income taxes...... Reclassification adjustment of investment appreciation included in net earnings.. 2007 2006 2005 $ 2,523 $9,278 $ 2,081 Applicable income taxes... Foreign currency translation adjustments Applicable income taxes..... Prior service cost and actuarial gains (losses) of defined benefit plans Applicable income taxes..... Other, including minority interests Other comprehensive income Adoption of SFAS 158.... Accumulated other comprehensive income at beginning of year Accumulated other comprehensive income at end of year. (872) (3.246) (728) (5,494) (1.646) (6,261) 1,923 576 2,191 456 603 (359) (26) 1 (26) 257 563 (62) (102) (196) 38 (22) (13) 51 (1,357) 5,920 (3,075) (303) 22,977 17,360 20,435 $21,620 $22.977 $17,360