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Acquisitions and Divestitures (Textuals) (Details) - USD ($)			3 Months Ended	9 Months Ended
	Jun. 15, 2023	May 24, 2023	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Business Acquisition [Line Items]
Acquisition of business, net of cash acquired				$ 476,000,000	$ 0
Goodwill			$ 7,149,000,000	7,149,000,000		$ 2,719,000,000
Operating income (loss)				14,000,000	$ 63,000,000
Disposal Group, Not Discontinued Operations
Business Acquisition [Line Items]
Proceeds from sale of business	$ 91,000,000
Evoqua Acquisition
Business Acquisition [Line Items]
Business Combination, Share Conversion Ratio		0.48
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		$ 6,121,000,000
Business Combination, Consideration Transferred		6,900,000,000
Business Combination, Consideration Transferred, Liabilities Paid		619,000,000
Business Combination, Consideration Transferred, Equity Interest Issued And Issuable, Replacement Equity Awards		160,000,000
Receivables, net		322,000,000
Receivables, net		329,000,000
Accounts Receivable, Allowance for Credit Loss		7,000,000
Revenue			540,000,000
Goodwill		4,442,000,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 56,000,000
Acquisition costs			1,000,000	56,000,000
Operating income (loss)				718,000,000
Evoqua Acquisition \| Equity Option
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions		2,000,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			2,000,000	2,000,000
Evoqua Acquisition \| Performance share units
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions		330,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			3,000,000	3,000,000
Evoqua Acquisition \| Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions		377,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			$ 13,000,000	$ 13,000,000
Evoqua Acquisition \| Stock Appreciation Rights (SARs)
Business Acquisition [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		3 years
Evoqua Acquisition \| Legacy Evoqua Stockholders
Business Acquisition [Line Items]
Subsidiary, Ownership Percentage, Noncontrolling Owner		25.00%
Evoqua Acquisition \| Legacy Xylem Stockholders
Business Acquisition [Line Items]
Subsidiary, Ownership Percentage, Parent		75.00%