Shareholders' Equity (Tables)

12 Months Ended

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.