Related Party Transactions - Schedule of Related Party Balances (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Iberdrola, S.A.
Related Party Transaction [Line Items]
Owed By	$ 3	$ 2
Owed To	(43)	(43)
Iberdrola Financiación, S.A.
Related Party Transaction [Line Items]
Owed By	0	0
Owed To	(9)	(6)
Siemens Gamesa
Related Party Transaction [Line Items]
Owed By	8	4
Owed To	(8)	0
Vineyard Wind
Related Party Transaction [Line Items]
Owed By	0	5
Owed To	(2)	0
Iberdrola Solutions
Related Party Transaction [Line Items]
Owed By	0	1
Owed To	$ (1)	$ (1)

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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+ Details

- Definition

Carrying amount as of the balance sheet date of obligations due all related parties.

+ References

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+ Details