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Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement [Abstract] |  |  |  |
Revenue | $ 3,341 | $ 3,135 | $ 10,339 | $ 9,847
Expense: |  |  |  |
Compensation and benefits | 1,906 | 1,817 | 5,786 | 5,543
Other operating expenses | 838 | 746 | 2,383 | 2,273
Operating expenses | 2,744 | 2,563 | 8,169 | 7,816
Operating income | 597 | 572 | 2,170 | 2,031
Interest income | 2 | 0 | 6 | 4
Interest expense | (60) | (47) | (178) | (141)
Investment income |  | 1 | 3 |
Investment loss | (2) |  |  | (2)
Income before income taxes | 537 | 525 | 2,001 | 1,892
Income tax expense | 140 | 141 | 519 | 538
Net income before non-controlling interests | 397 | 384 | 1,482 | 1,354
Less: Net income attributable to non-controlling interests | 4 | 5 | 19 | 22
Net income attributable to the Company | $ 393 | $ 379 | $ 1,463 | $ 1,332
Net Income Per Share Attributable to the Company: |  |  |  |
Basic net income per share attributable to the Company (usd per share) | $ 0.77 | $ 0.73 | $ 2.85 | $ 2.56
Diluted net income per share attributable to the Company (usd per share) | $ 0.76 | $ 0.73 | $ 2.81 | $ 2.54
Average number of shares outstanding: |  |  |  |
Average number of shares outstanding - Basic | 512 | 518 | 514 | 520
Average number of shares outstanding - Diluted | 519 | 523 | 520 | 525
Shares outstanding at September 30, | 511 | 516 | 511 | 516

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