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Shareholders' Equity | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity Note [Abstract] |
Shareholders' Equity | Shareholders’ Equity Shares of common stock The following table summarizes total shares of common stock outstanding:
| December 31
Millions of shares | 2020 | 2019
Issued | 1,066 |  | 1,068 |
In treasury | (181) |  | (190) |
Total shares of common stock outstanding | 885 |  | 878 |
Our Board of Directors has authorized a program to repurchase a specified dollar amount of our common stock from time to time. The program does not require a specific number of shares to be purchased and the program may be effected through solicited or unsolicited transactions in the market or in privately negotiated transactions. The program may be terminated or suspended at any time. During the year ended December 31, 2020 we repurchased approximately 7.4 million shares of our common stock for a total cost of $100 million. There were 4.5 million repurchases made under the program during the year ended December 31, 2019. Approximately $5.1 billion remained authorized for repurchases as of December 31, 2020. From the inception of this program in February 2006 through December 31, 2020, we repurchased approximately 224 million shares of our common stock for a total cost of approximately $9.0 billion. Paid-in Capital in Excess of Par Value During 2020, we issued common stock from treasury shares under our employee stock purchase plan awards and for restricted stock grants. As a result, additional paid in capital was reduced below zero, which resulted in a reduction of retained earnings by $75 million. Additional issuances from treasury shares could similarly impact additional paid in capital and retained earnings. Preferred stock Our preferred stock consists of five million total authorized shares at December 31, 2020, of which none are issued. Accumulated other comprehensive loss Accumulated other comprehensive loss consisted of the following:
| December 31
Millions of dollars | 2020 | 2019
Defined benefit and other postretirement liability adjustments (a) | $ | (226) |  | $ | (214) |
Cumulative translation adjustment | (83) |  | (82) |
Other | (53) |  | (66) |
Total accumulated other comprehensive loss | $ | (362) |  | $ | (362) |
(a) Included net actuarial losses for our international pension plans of $212 million at December 31, 2020 and $189 million at December 31, 2019.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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