Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

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, 2018	$	(4)	$	10	$	(621)	$	(14)	$	(629)
Other comprehensive income/(loss), net of tax	1		4		(45)		—		(40)
Balance, June 30, 2019	$	(3)	$	14	$	(666)	$	(14)	$	(669)
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)