Subsidiary Debt - Northern Powergrid (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Par value	$ 51,702
Subsidiary debt
Debt Instrument [Line Items]
Par value	37,501
Subsidiary debt	37,539	$ 36,659
Northern Powergrid \| Subsidiary debt
Debt Instrument [Line Items]
Par value	3,085
Subsidiary debt	$ 3,054	3,287
Northern Powergrid \| Subsidiary debt \| 4.133% European Investment Bank loans, due 2022
Debt Instrument [Line Items]
Stated rate	4.133%
Par value	$ 0
Subsidiary debt	$ 0	204
Northern Powergrid \| Subsidiary debt \| 7.25% Bonds, due 2022
Debt Instrument [Line Items]
Stated rate	7.25%
Par value	$ 0
Subsidiary debt	$ 0	269
Northern Powergrid \| Subsidiary debt \| 2.50% Bonds, due 2025
Debt Instrument [Line Items]
Stated rate	2.50%
Par value	$ 182
Subsidiary debt	$ 181	202
Northern Powergrid \| Subsidiary debt \| 2.073% European Investment Bank loan, due 2025
Debt Instrument [Line Items]
Stated rate	2.073%
Par value	$ 60
Subsidiary debt	$ 62	69
Northern Powergrid \| Subsidiary debt \| 2.564% European Investment Bank loans, due 2027
Debt Instrument [Line Items]
Stated rate	2.564%
Par value	$ 302
Subsidiary debt	$ 301	337
Northern Powergrid \| Subsidiary debt \| 7.25% Bonds, due 2028
Debt Instrument [Line Items]
Stated rate	7.25%
Par value	$ 224
Subsidiary debt	$ 227	254
Northern Powergrid \| Subsidiary debt \| 4.375% Bonds, due 2032
Debt Instrument [Line Items]
Stated rate	4.375%
Par value	$ 182
Subsidiary debt	$ 179	200
Northern Powergrid \| Subsidiary debt \| 5.125% Bonds, due 2035
Debt Instrument [Line Items]
Stated rate	5.125%
Par value	$ 242
Subsidiary debt	$ 240	268
Northern Powergrid \| Subsidiary debt \| 5.125% Bonds, due 2035
Debt Instrument [Line Items]
Stated rate	5.125%
Par value	$ 182
Subsidiary debt	$ 180	201
Northern Powergrid \| Subsidiary debt \| 2.750% Bonds, due 2049
Debt Instrument [Line Items]
Stated rate	2.75%
Par value	$ 182
Subsidiary debt	$ 178	200
Northern Powergrid \| Subsidiary debt \| 3.250% Bonds, due 2052
Debt Instrument [Line Items]
Stated rate	3.25%
Par value	$ 423
Subsidiary debt	$ 419	0
Northern Powergrid \| Subsidiary debt \| 2.250% Bonds, due 2059
Debt Instrument [Line Items]
Stated rate	2.25%
Par value	$ 363
Subsidiary debt	$ 355	398
Northern Powergrid \| Subsidiary debt \| 1.875% Bonds, due 2062
Debt Instrument [Line Items]
Stated rate	1.875%
Par value	$ 363
Subsidiary debt	356	398
Northern Powergrid \| Subsidiary debt \| Variable-rate loan, due 2025
Debt Instrument [Line Items]
Par value	163
Subsidiary debt	$ 164	0
Percentage bearing variable interest	70.00%
Percentage bearing fixed interest	30.00%
Interest rate on derivatives	100.00%
Variable rate	5.20%
Basis spread on variable rate	2.00%
Fixed interest rate	3.09%
Northern Powergrid \| Subsidiary debt \| Variable-rate loan, due 2026
Debt Instrument [Line Items]
Par value	$ 217
Subsidiary debt	$ 212	$ 287
Interest rate on derivatives	80.00%
Variable rate	4.98%
Basis spread on variable rate	1.55%
Fixed interest rate	2.45%
Effective interest rate	2.95%

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Long-Term Debt, Percentage Bearing Variable Interest

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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