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Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Income Statement [Abstract] |  |
Revenue | $ 4,000 | $ 3,503
Expense: |  |
Compensation and benefits | 2,224 | 2,005
Other operating expenses | 868 | 749
Operating expenses | 3,092 | 2,754
Operating income | 908 | 749
Other net benefit credits | 66 | 60
Interest income | 3 | 2
Interest expense | (61) | (58)
Investment income | 0 | 0
Income before income taxes | 916 | 753
Income tax expense | 220 | 175
Net income before non-controlling interests | 696 | 578
Less: Net income attributable to non-controlling interests | 6 | 9
Net income attributable to the Company | $ 690 | $ 569
Net Income Per Share Attributable to the Company: |  |
Basic net income per share attributable to the Company (usd per share) | $ 1.36 | $ 1.10
Diluted net income per share attributable to the Company (usd per share) | $ 1.34 | $ 1.09
Average number of shares outstanding: |  |
Average number of shares outstanding - Basic | 508 | 515
Average number of shares outstanding - Diluted | 514 | 522
Shares outstanding at March 31, | 508 | 515

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