Construction Commitment, Ownership Share

No definition available.

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- Definition

[Line Items] for Disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Easement, Expense

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of purchase arrangement to be paid after fifth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of purchase arrangement to be paid in fifth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of purchase arrangement to be paid in fourth fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of purchase arrangement to be paid in next fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of purchase arrangement to be paid in second fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of purchase arrangement to be paid in third fiscal year following current fiscal year. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitment, and short-term purchase commitment. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Data Type:	na
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- Details

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Commitments and Contingencies - SPPC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Contractual Obligation [Line Items]
2025	$ 6,222
2026	4,008
2027	3,133
2028	2,451
2029	2,128
Thereafter	21,462
Purchase obligation	39,404
Construction commitments
Contractual Obligation [Line Items]
2025	3,300
2026	1,610
2027	838
2028	295
2029	66
Thereafter	30
Purchase obligation	6,139
Easements
Contractual Obligation [Line Items]
2025	85
2026	88
2027	90
2028	91
2029	91
Thereafter	3,105
Purchase obligation	3,550
Maintenance, service and other contracts
Contractual Obligation [Line Items]
2025	446
2026	430
2027	363
2028	270
2029	218
Thereafter	918
Purchase obligation	2,645
SPPC
Contractual Obligation [Line Items]
2025	1,461
2026	1,005
2027	602
2028	306
2029	206
Thereafter	4,233
Purchase obligation	7,813
Easement expense	$ 2	$ 2	$ 2
Construction commitment, ownership share	90.00%
SPPC \| Purchased electricity contracts - commercially operable
Contractual Obligation [Line Items]
2025	$ 119
2026	120
2027	112
2028	106
2029	97
Thereafter	1,370
Purchase obligation	1,924
SPPC \| Purchased electricity contracts - non-commercially operable
Contractual Obligation [Line Items]
2025	9
2026	25
2027	41
2028	54
2029	63
Thereafter	2,773
Purchase obligation	2,965
SPPC \| Fuel contracts
Contractual Obligation [Line Items]
2025	67
2026	54
2027	27
2028	27
2029	26
Thereafter	58
Purchase obligation	259
SPPC \| Construction commitments
Contractual Obligation [Line Items]
2025	1,224
2026	784
2027	401
2028	117
2029	17
Thereafter	0
Purchase obligation	2,543
SPPC \| Transmission
Contractual Obligation [Line Items]
2025	28
2026	4
2027	5
2028	0
2029	0
Thereafter	0
Purchase obligation	37
SPPC \| Easements
Contractual Obligation [Line Items]
2025	2
2026	2
2027	2
2028	1
2029	2
Thereafter	30
Purchase obligation	39
SPPC \| Maintenance, service and other contracts
Contractual Obligation [Line Items]
2025	12
2026	16
2027	14
2028	1
2029	1
Thereafter	2
Purchase obligation	46
NPC
Contractual Obligation [Line Items]
2025	1,161
2026	1,124
2027	980
2028	875
2029	737
Thereafter	9,747
Purchase obligation	14,624
Easement expense	$ 4	$ 4	$ 4
Construction commitment, ownership share	10.00%
NPC \| Purchased electricity contracts - commercially operable
Contractual Obligation [Line Items]
2025	$ 407
2026	410
2027	411
2028	388
2029	391
Thereafter	4,556
Purchase obligation	6,563
NPC \| Purchased electricity contracts - non-commercially operable
Contractual Obligation [Line Items]
2025	0
2026	4
2027	83
2028	261
2029	261
Thereafter	5,011
Purchase obligation	5,620
NPC \| Fuel contracts
Contractual Obligation [Line Items]
2025	55
2026	54
2027	53
2028	47
2029	45
Thereafter	79
Purchase obligation	333
NPC \| Construction commitments
Contractual Obligation [Line Items]
2025	667
2026	597
2027	387
2028	153
2029	32
Thereafter	27
Purchase obligation	1,863
NPC \| Transmission
Contractual Obligation [Line Items]
2025	12
2026	28
2027	11
2028	7
2029	5
Thereafter	42
Purchase obligation	105
NPC \| Easements
Contractual Obligation [Line Items]
2025	4
2026	4
2027	4
2028	4
2029	2
Thereafter	32
Purchase obligation	50
NPC \| Maintenance, service and other contracts
Contractual Obligation [Line Items]
2025	16
2026	27
2027	31
2028	15
2029	1
Thereafter	0
Purchase obligation	$ 90