Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Debt - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Debt - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2026	Jul. 01, 2026	Jun. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total debt			$ 23,300	$ 23,400
Retired debt	$ 67
Variable Rate Debt Bonds
Debt Instrument [Line Items]
Debt at face value			$ 283
6.875% Debentures due 2026 \| Debentures
Debt Instrument [Line Items]
Stated interest rate	6.875%
3.00% Sub-Series 2017D Bonds \| Variable Rate Debt Bonds \| Subsequent Event
Debt Instrument [Line Items]
Stated interest rate		3.00%
Debt at face value		$ 600
Revenue Refunding Bonds Due 2037 \| Variable Rate Debt Bonds \| Subsequent Event
Debt Instrument [Line Items]
Debt at face value		$ 1,000