Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Changes, Net of Tax, in Accumulated Other Comprehensive Loss

Changes, net of tax, in accumulated other comprehensive loss, were as follows:

			Currency Translation Adjustments
					Other Currency				Accumulated Other
	Cash Flow		Net Investment		Translation				Comprehensive
(MILLIONS OF DOLLARS)	Hedges		Hedges		Adjustments		Benefit Plans		Loss
Balance, December 31, 2020	$	(15)	$	(37)	$	(655)	$	(23)	$	(730)
Other comprehensive income, net of tax	39		25		33		—		97
Balance, March 31, 2021	$	24	$	(12)	$	(622)	$	(23)	$	(633)
Balance, December 31, 2019	$	—	$	21	$	(724)	$	(23)	$	(726)
Other comprehensive (loss)/income, net of tax	(28)		17		(44)		—		(55)
Balance, March 31, 2020	$	(28)	$	38	$	(768)	$	(23)	$	(781)