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Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Cash collateral netted against Derivative assets $ (18) $ (35)
Cash collateral netted against Derivative liabilities 44 5
Cash collateral recorded in Accounts receivable 30 20
Cash collateral recorded in Accounts payable (13) (28)
Total net cash collateral posted (received) $ 43 $ (38)