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Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Income Statement [Abstract] |  |
Revenue | $ 4,651 | $ 4,071
Expense: |  |
Compensation and benefits | 2,555 | 2,282
Other operating expenses | 1,026 | 851
Operating expenses | 3,581 | 3,133
Operating income | 1,070 | 938
Other net benefit credits | 64 | 64
Interest income | 2 | 28
Interest expense | (127) | (120)
Investment (loss) income | (2) | 5
Acquisition related derivative contracts | 0 | 29
Income before income taxes | 1,007 | 944
Income tax expense | 240 | 217
Net income before non-controlling interests | 767 | 727
Less: Net income attributable to non-controlling interests | 13 | 11
Net income attributable to the Company | $ 754 | $ 716
Net income per share attributable to the Company: |  |
Basic net income per share attributable to the Company (usd per share) | $ 1.49 | $ 1.42
Diluted net income per share attributable to the Company (usd per share) | $ 1.48 | $ 1.40
Average number of shares outstanding: |  |
Average number of shares outstanding - Basic (in shares) | 505 | 505
Average number of shares outstanding - Diluted (in shares) | 510 | 511
Shares outstanding (in shares) | 506 | 507

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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