Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 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	20		17		70		—		107
Balance, June 30, 2021	$	5	$	(20)	$	(585)	$	(23)	$	(623)
Balance, December 31, 2019	$	—	$	21	$	(724)	$	(23)	$	(726)
Other comprehensive (loss)/income, net of tax	(32)		3		(101)		—		(130)
Balance, June 30, 2020	$	(32)	$	24	$	(825)	$	(23)	$	(856)