Cash paid for Income Taxes (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash Paid for income taxes [Line Items]
Income Tax Paid, Federal, after Refund Received	[1]	$ 102	$ 164	$ (69)
Income Taxes Paid, Net		100	159	(80)
New Mexico
Cash Paid for income taxes [Line Items]
Income Tax Paid, State and Local, after Refund Received		0	(3)	(10)
Other State Income Taxes
Cash Paid for income taxes [Line Items]
Income Tax Paid, State and Local, after Refund Received		$ (2)	$ (2)	$ (1)

[1] Includes proceeds from tax credit transfers.