Liabilities
The biggest liability on Apple's balance sheet is its long-term debt, which stands at about $95.3 billion. It also has a smaller amount of short-term debt plus about $63 billion in accounts payable (e.g., to its part suppliers). Although Apple has almost $109 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, to name just a few. In all, Apple has about $290.4 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 $62.1 billion. As noted, think of this as the amount of money that would theoretically be left if Apple decided to cease business operations, sell everything it owns, and pay off its debts.
This is not a measure of how much the business is worth. Apple is a highly profitable and efficient business growing rather quickly, even with its large size. In fact, Apple's market value is currently about $2.7 trillion -- about 43 times its shareholders' equity or book value.
Again, shareholders' equity is most useful when evaluating value stocks and comparing stocks' valuations in similar industries. For example, the price-to-book (P/B) ratio is especially useful when evaluating bank stocks since other common valuation metrics (like the price-to-earnings ratio) aren't always a great fit.
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