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Employee Benefit Plans (Amounts Recognized in the Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current pension and PRB liabilities (included in Accrued employee compensation)	$ 257	$ 256
Future pension and postretirement benefit obligations	1,981	2,104
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Non-current pension assets (included in Other assets)	2,659	1,819
Future pension and postretirement benefit obligations	1,434	1,532
PRB
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Future pension and postretirement benefit obligations	480	523
Other pension and PRB related items
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Future pension and postretirement benefit obligations	$ 67	$ 49

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