Capitalization (Narrative) (Details) - USD ($)							1 Months Ended			3 Months Ended			6 Months Ended	12 Months Ended
	Jun. 29, 2023	Dec. 14, 2022	Oct. 14, 2022	May 20, 2022	May 02, 2022	Apr. 23, 2019	Jan. 31, 2023	Oct. 31, 2022	Apr. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Issuance of common stock from forward equity sale agreement			$ 500,000,000
Stock purchase contracts early settled by holders of the contracts									981,919
Shares settled					6,621,315				1,166,107
Issuance of common stock from stock purchase contracts , shares					7,863,354							9,029,461
Conversion to shares					$ 1.18758
At Market Sales Agreements [Member]
Debt Instrument [Line Items]
Sale of stock, shares							399,128			0	1,321,994
Common stock issued							$ 19,294,000				$ 63,040,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt term				5 years
Repayment of line of credit				$ 410,000,000
Notes at 5.30%, due 2052 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate				5.30%						5.30%	5.30%		5.30%	5.30%
Maturity date													2052	2052
Debt issuance expense				$ 5,815,000
Maturity Year				2052
Unsecured notes payable				$ 500,000,000						$ 500,000,000	$ 500,000,000		$ 500,000,000	$ 500,000,000
Amended Unsecured Facility [Member]
Debt Instrument [Line Items]
Debt term	364 days
Unsecured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount borrowed		$ 1,000,000													$ 1,000,000
Debt term		5 years													5 years
Sublimit for daily demand loans		$ 100,000											82,362
Available barrowing capacity credit sublimit										100,000			100,000
Available capacity borrowed										677,000			677,000
Unsecured Debt [Member] | Swing Line Commitment [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Available barrowing capacity credit sublimit										100,000			100,000
Swing-line commitment													0
Available capacity borrowed										$ 305,362			$ 305,362
Aqua Pennsylvania, Inc [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate							5.60%	4.50%
Face Amount							$ 75,000,000	$ 125,000,000
Maturity Year							2043	2052
Aqua Pennsylvania, Inc [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayment of line of credit				$ 49,700,000
Aqua Pennsylvania, Inc [Member] | Amended Unsecured Facility [Member]
Debt Instrument [Line Items]
Amount borrowed	$ 100,000,000
LDC Funding LLC [Member]
Debt Instrument [Line Items]
Private placement, per share						$ 50.00
Proceeds from tangible equity units						$ 690,000,000
Debt instrument, interest rate						3.00%
Initial principal amount						$ 119,081,000
Initial principal amount per share						$ 8.62909
Cash installment						$ 0.75
Cash installment rate						6.00%
Debt issuance expense						$ 16,358,000
LDC Funding LLC [Member] | July 30, 2019 [Member]
Debt Instrument [Line Items]
Cash installment						$ 0.80833
Peoples Gas Acquisition [Member] | Amended Unsecured Facility [Member]
Debt Instrument [Line Items]
Amount borrowed	$ 300,000,000