Fair-Value Measurements (Narrative) (Details) - USD ($) $ in Billions	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of senior unsecured notes	$ 3.2	$ 3.1
Fair value of senior unsecured notes	$ 3.2	$ 3.2

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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+ Details