It's as official as it's going to get for now: JPMorgan Chase & Co. is the world's largest bank by total assets, using the best available data for apples-to-apples comparisons. Differences in global accounting standards historically have made size comparisons between U.S. and overseas banks difficult. Companies that use the International Accounting Standards Board's rules to prepare their financial statements must show gross values for derivatives and certain other types of financial instruments. Companies that use U.S. generally accepted accounting principles have been allowed to report smaller net values for the ... (full story)