Summary of Significant Accounting Policies (Income Taxes Paid) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Paid, by Individual Jurisdiction [Line Items]
Federal	$ 204	$ 186	$ 263
State	11	12	15
Total cash payments for income taxes	263	281	282
Canada
Income Tax Paid, by Individual Jurisdiction [Line Items]
Foreign	18	57	(5)
Other
Income Tax Paid, by Individual Jurisdiction [Line Items]
Foreign	$ 30	$ 26	$ 9

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Amount, after income tax refund received, of cash paid to federal (national) tax jurisdiction for tax on income.

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Amount, after refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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