Stockholders' Equity (Tables)

9 Months Ended

Sep. 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	21		33		9		—		63
Balance, September 30, 2021	$	6	$	(4)	$	(646)	$	(23)	$	(667)
Balance, December 31, 2019	$	—	$	21	$	(724)	$	(23)	$	(726)
Other comprehensive (loss)/income, net of tax	(27)		(27)		46		(1)		(9)
Balance, September 30, 2020	$	(27)	$	(6)	$	(678)	$	(24)	$	(735)