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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On April 27, 2020, the board of directors of AVANGRID declared a quarterly dividend of $0.44 per share on its common stock. This dividend is payable on July 1, 2020 to shareholders of record at the close of business on June 2, 2020.