Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 31	$ 139	$ 69	$ 218
Other comprehensive income (loss), before tax:
Foreign currency translation adjustment	35	(18)	(43)	11
Net change in derivative hedge agreements:
Unrealized gain (loss)	6	0	4	(9)
Amount of loss reclassified into net income	0	2	3	4
Net change in postretirement benefit plans:
Amortization of prior service credit	(1)	(1)	(2)	(2)
Amortization of net actuarial loss into net income	5	3	10	6
Other comprehensive income (loss), before tax	45	(14)	(28)	10
Income tax (benefit) expense related to items of other comprehensive income (loss)	(7)	(3)	7	1
Other comprehensive income (loss), net of tax	52	(11)	(35)	9
Comprehensive income	83	128	34	227
Less: comprehensive loss attributable to noncontrolling interests	0	0	(1)	0
Comprehensive income attributable to Xylem	$ 83	$ 128	$ 35	$ 227