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Stockholders' Equity and Noncontrolling Interests | 3 Months Ended
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Mar. 31, 2018
Stockholders' Equity Note [Abstract] |
Stockholders' Equity and Noncontrolling Interests | Stockholders' Equity and Noncontrolling Interests We had 2.0 billion shares of preferred stock and 5.0 billion shares of common stock authorized for issuance and 1.4 billion shares of common stock issued and outstanding at March 31, 2018 and December 31, 2017. In the three months ended March 31, 2018 we purchased three million shares of our outstanding common stock for $100 million as part of the common stock repurchase program announced in March 2015, which our Board of Directors increased and extended in January 2016 and January 2017. We did not purchase shares of our outstanding common stock in the three months ended March 31, 2017. Our total dividends paid on common stock were $536 million and $573 million in the three months ended March 31, 2018 and 2017. The following table summarizes the significant components of Accumulated other comprehensive loss:
| Three Months Ended
| March 31, 2018 |  | March 31, 2017
Foreign Currency Translation Adjustments |  |  |
Balance at beginning of period | $ | (1,606 | ) |  | $ | (2,355 | )
Other comprehensive income and noncontrolling interests, net of reclassification adjustment, tax and impact of adoption of accounting standards(a)(b)(c)(d) | 108 |  |  | 91 |
Balance at end of period | $ | (1,498 | ) |  | $ | (2,264 | )
Defined Benefit Plans |  |  |
Balance at beginning of period | $ | (6,398 | ) |  | $ | (6,968 | )
Other comprehensive loss before reclassification adjustment, net of tax and impact of adoption of accounting standards(c)(d) | (170 | ) |  | (77 | )
Reclassification adjustment, net of tax(c) | 44 |  |  | 48 |
Other comprehensive loss, net of tax and impact of adoption of accounting standards(c)(d) | (126 | ) |  | (29 | )
Balance at end of period | $ | (6,524 | ) |  | $ | (6,997 | )
__________
(a) | The noncontrolling interests were insignificant in the three months ended March 31, 2018 and 2017.
(b) | The reclassification adjustment was insignificant in the three months ended March 31, 2018 and 2017.
(c) | The income tax effect was insignificant in the three months ended March 31, 2018 and 2017.
(d) | Refer to Note 1 for additional information on adoption of accounting standards.

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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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