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Revenues and Contract Costs - Contract with Customer, Asset and Liability (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets    
Prepaid expenses and other $ 549 $ 621
Other assets 292 321
Total Contract Assets 841 942
Liabilities    
Other current liabilities 7,504 7,492
Other liabilities 2,237 2,186
Total Contract Liabilities $ 9,741 $ 9,678