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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Components of fixed assets | The components of fixed assets are as follows:
December 31, |  |  |  |
(In millions of dollars) |  | 2017 |  |  | 2016 |
Furniture and equipment |  | $ | 1,179 |  |  | $ | 1,113 |
Land and buildings |  | 385 |  |  | 389 |
Leasehold and building improvements |  | 974 |  |  | 906 |
|  | 2,538 |  |  | 2,408 |
Less-accumulated depreciation and amortization |  | (1,826 | ) |  | (1,683 | )
|  | $ | 712 |  |  | $ | 725 |
Diluted earnings per share for continuing operations | Reconciliations of the applicable components used to calculate basic and diluted EPS - Continuing Operations are presented below. The reconciling items related to the EPS calculation are the same for both basic and diluted EPS.
Basic and Diluted EPS Calculation - Continuing Operations
(In millions, except per share figures) | 2017 |  |  | 2016 |  |  | 2015 |
Net income from continuing operations | $ | 1,510 |  |  | $ | 1,795 |  |  | $ | 1,636 |
Less: Net income attributable to non-controlling interests | 20 |  |  | 27 |  |  | 37 |
| $ | 1,490 |  |  | $ | 1,768 |  |  | $ | 1,599 |
Basic weighted average common shares outstanding | 513 |  |  | 519 |  |  | 531 |
Dilutive effect of potentially issuable common shares | 6 |  |  | 5 |  |  | 5 |
Diluted weighted average common shares outstanding | 519 |  |  | 524 |  |  | 536 |
Average stock price used to calculate common stock equivalents | $ | 77.30 |  |  | $ | 63.51 |  |  | $ | 56.27 |
Schedule of Prospective Adoption of New Accounting Pronouncements |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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