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Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement [Abstract] |  |  |  |
Revenue | $ 3,734 | $ 3,495 | $ 7,734 | $ 6,998
Expense: |  |  |  |
Compensation and benefits | 2,135 | 1,998 | 4,359 | 4,003
Other operating expenses | 908 | 796 | 1,776 | 1,545
Operating expenses | 3,043 | 2,794 | 6,135 | 5,548
Operating income | 691 | 701 | 1,599 | 1,450
Other net benefit credits | 65 | 63 | 131 | 123
Interest income | 3 | 2 | 6 | 4
Interest expense | (68) | (60) | (129) | (118)
Investment income | 28 | 5 | 28 | 5
Income before income taxes | 719 | 711 | 1,635 | 1,464
Income tax expense | 183 | 204 | 403 | 379
Net income before non-controlling interests | 536 | 507 | 1,232 | 1,085
Less: Net income attributable to non-controlling interests | 5 | 6 | 11 | 15
Net income attributable to the Company | $ 531 | $ 501 | $ 1,221 | $ 1,070
Net Income Per Share Attributable to the Company: |  |  |  |
Basic net income per share attributable to the Company (usd per share) | $ 1.05 | $ 0.98 | $ 2.41 | $ 2.08
Diluted net income per share attributable to the Company (usd per share) | $ 1.04 | $ 0.96 | $ 2.38 | $ 2.05
Average number of shares outstanding: |  |  |  |
Average number of shares outstanding - Basic | 507 | 514 | 507 | 514
Average number of shares outstanding - Diluted | 512 | 520 | 513 | 521
Shares outstanding at June 30, | 505 | 513 | 505 | 513

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