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Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Cash collateral netted against Derivative assets $ (23) $ (35)
Cash collateral netted against Derivative liabilities 32 5
Cash collateral recorded in Accounts receivable 77 20
Cash collateral recorded in Accounts payable (16) (28)
Total net cash collateral posted (received) $ 70 $ (38)