American International Group (NYSE: AIG) filed its 10-K on Feb. 23. Here are the numbers you need to know.

The 10-second takeaway
For the quarter ended Dec. 31 (Q4), American International Group crushed expectations on both revenues and earnings per share.

Compared to the prior-year quarter, revenue was unchanged and GAAP earnings per share dropped significantly.

Margins improved across the board.

Revenue details
American International Group recorded revenue of $17.41 billion. The three analysts polled by S&P Capital IQ expected net sales of $13.19 billion on the same basis. GAAP reported sales were 20% lower than the prior-year quarter's $21.81 billion.

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Source: S&P Capital IQ. Quarterly periods. Dollar amounts in millions. Non-GAAP figures may vary to maintain comparability with estimates.

EPS details
Non-GAAP EPS came in at $0.82. The 15 earnings estimates compiled by S&P Capital IQ averaged $0.65 per share on the same basis. GAAP EPS of $10.42 for Q4 were 35% lower than the prior-year quarter's $16.07 per share.

Source: S&P Capital IQ. Quarterly periods. Non-GAAP figures may vary to maintain comparability with estimates.

Margin details
For the quarter, gross margin was 22.8%, 2,000 basis points better than the prior-year quarter. Operating margin was 18.9%, 2,010 basis points better than the prior-year quarter. Net margin was 113.6%, 6,230 basis points better than the prior-year quarter.

Looking ahead
Next quarter's average estimate for revenue is $13.42 billion. On the bottom line, the average EPS estimate is $0.67.

Next year's average estimate for revenue is $49.40 billion. The average EPS estimate is $2.66.

Investor sentiment
The stock has a two-star rating (out of five) at Motley Fool CAPS, with 2,280 members out of 2,868 rating the stock outperform, and 588 members rating it underperform. Among 592 CAPS All-Star picks (recommendations by the highest-ranked CAPS members), 475 give American International Group a green thumbs-up, and 117 give it a red thumbs-down.

Of Wall Street recommendations tracked by S&P Capital IQ, the average opinion on American International Group is outperform, with an average price target of $27.36.

Seth Jayson had no position in any company mentioned here at the time of publication. You can view his stock holdings here. He is co-advisor of Motley Fool Hidden Gems, which provides new small-cap ideas every month, backed by a real-money portfolio. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.