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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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