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Fair Value Disclosures (Estimated Fair Values and Carrying Amounts of Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Cash and cash equivalents	$ 57	$ 100
Cash and cash equivalents, fair value	57	100
Restricted Cash and Cash Equivalent	181	175
Restricted Cash and Cash Equivalents Fair Value Disclosure	181	175
Long-term debt and other obligations, carrying amount	24,319	24,054
Long-term debt and other obligations, fair value	$ 23,193	$ 22,371

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- Definition

The fair value of cash and cash equivalent items which are restricted as to withdrawal or usage.

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Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of short-term and long-term debt and lease obligation.

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Fair value of obligations measured on a recurring basis.

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Amount of cash and cash equivalent restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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