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Equity | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Equity | Equity As of March 31, 2018, we had $1.86 billion of share repurchase authorization remaining under authorizations from our board of directors. We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, accelerated share repurchases or open market solicitations for shares, some of which may be effected through Rule 10b5-1 plans. The timing and amount of future repurchases, if any, will depend upon several factors, including market and business conditions, and such repurchases may be discontinued at any time. Total share repurchases were as follows:
| Three Months Ended March 31,
(In millions, except per share data) | 2018 |  | 2017
Number of shares repurchased | 19 |  |  | 9 |
Cash paid for shares repurchased | $ | 1,327 |  |  | $ | 420 |
Average cost per share | $ | 68.74 |  |  | $ | 50.15 |
As of March 31, 2018, we had agreements to acquire 619,415 common shares for $45 million, which were settled in early April 2018.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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