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Other Liabilities (Tables)
 12 Months Ended
Dec. 31, 2024
Other Liabilities Disclosure [Abstract]  
Other liabilities
($ in millions)
At December 31:20242023
Income tax reserves $6,865 $6,916 
Deferred taxes815 1,146 
Excess Savings Plan1,445 1,437 
Disability benefits274 308 
Derivative liabilities463 299 
Workforce reductions445 526 
Environmental accruals204 206 
Other536 639 
Total$11,048 $11,475