Fair Value Measurements - SPPC (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Assets:
Assets, fair value	$ 6,393	$ 3,566
Investment funds
Assets:
Equity securities	265	283
Money market mutual funds
Assets:
Money market mutual funds	3,613	1,469
Level 1
Assets:
Assets, fair value	5,295	2,648
Level 1 \| Investment funds
Assets:
Equity securities	265	283
Level 1 \| Money market mutual funds
Assets:
Money market mutual funds	3,613	1,469
Level 2
Assets:
Assets, fair value	1,088	916
Level 2 \| Investment funds
Assets:
Equity securities	0	0
Level 2 \| Money market mutual funds
Assets:
Money market mutual funds	0	0
Level 3
Assets:
Assets, fair value	16	10
Level 3 \| Investment funds
Assets:
Equity securities	0	0
Level 3 \| Money market mutual funds
Assets:
Money market mutual funds	0	0
Commodity derivatives \| Level 1
Assets:
Derivative asset, gross	0	0
Liabilities:
Commodity derivatives	(13)	(13)
Commodity derivatives \| Level 2
Assets:
Derivative asset, gross	44	47
Liabilities:
Commodity derivatives	(134)	(169)
Commodity derivatives \| Level 3
Assets:
Derivative asset, gross	3	2
Liabilities:
Commodity derivatives	(68)	(56)
SPPC
Assets:
Assets, fair value	157	16
SPPC \| Investment funds
Assets:
Equity securities	1	1
SPPC \| Money market mutual funds
Assets:
Money market mutual funds	156	14
SPPC \| Level 1
Assets:
Assets, fair value	157	15
SPPC \| Level 1 \| Investment funds
Assets:
Equity securities	1	1
SPPC \| Level 1 \| Money market mutual funds
Assets:
Money market mutual funds	156	14
SPPC \| Level 2
Assets:
Assets, fair value	0	0
SPPC \| Level 2 \| Investment funds
Assets:
Equity securities	0	0
SPPC \| Level 2 \| Money market mutual funds
Assets:
Money market mutual funds	0	0
SPPC \| Level 3
Assets:
Assets, fair value	0	1
SPPC \| Level 3 \| Investment funds
Assets:
Equity securities	0	0
SPPC \| Level 3 \| Money market mutual funds
Assets:
Money market mutual funds	0	0
SPPC \| Commodity derivatives
Assets:
Derivative asset, gross		1
Liabilities:
Commodity derivatives	(14)	(12)
SPPC \| Commodity derivatives \| Level 1
Assets:
Derivative asset, gross		0
Liabilities:
Commodity derivatives	0	0
SPPC \| Commodity derivatives \| Level 2
Assets:
Derivative asset, gross		0
Liabilities:
Commodity derivatives	0	0
SPPC \| Commodity derivatives \| Level 3
Assets:
Derivative asset, gross		1
Liabilities:
Commodity derivatives	$ (14)	$ (12)

Fair value portion of asset recognized for present right to economic benefit.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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