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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity Note [Abstract] |
Schedule of 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 |
Schedule of accumulated other comprehensive income (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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