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Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash collateral netted against Derivative assets	$ (35)	$ (17)
Cash collateral recorded in Accounts receivable	60	29
Cash collateral recorded in Accounts payable	(33)	(5)
Total net cash collateral posted (received)	$ (8)	$ 7

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.