Liabilities
The biggest liability on Apple's balance sheet is its long-term debt, which stands at about $56 billion. It also has a smaller amount of short-term debt plus about $57 billion in accounts payable (e.g., to its part suppliers). Although Apple has approximately $113 billion in current and noncurrent "other" liabilities -- certainly a lot of money -- the key point is that this is a very broad category.
On the current side, this can include things like payroll obligations, accrued benefits, and other items due within a year. On the noncurrent side, liabilities can include lease obligations, deferred tax credits, customer deposits, and pension obligations, among others. In all, Apple has about $265 billion in liabilities reported on its balance sheet.
Shareholders' equity
When we subtract Apple's liabilities from its assets, we see that its shareholders' equity is about $106.5 billion. As noted, think of this as the amount of money that would be left if Apple were to cease operations, sell everything it owns, and pay off its debts.
This is not a measure of how much this business is worth. Apple is a highly profitable and efficient business that is growing, even with its large size. In fact, Apple's market value is currently about $4.22 trillion -- about 40 times its shareholders' equity (book value).
Again, shareholders' equity is most useful for evaluating value stocks and comparing valuations across similar industries. For example, the price-to-book (P/B) ratio is especially useful when evaluating bank stocks, since other common valuation metrics (such as the price-to-earnings ratio) aren't always a good fit.
Related investing topics