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Debt - Assets and Liabilities Related to Asset-backed Debt Arrangements (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Prepaid expenses and other $ 7,684 $ 7,973
Other assets 21,012 19,769
Accounts payable and accrued liabilities 20,700 23,374
Debt maturing within one year 20,146 22,633
Long-term debt 126,629 121,381
Variable Interest Entity, Primary Beneficiary    
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]    
Accounts receivable, net 18,381 18,339
Prepaid expenses and other 305 322
Other assets 11,949 11,647
Accounts payable and accrued liabilities 34 37
Debt maturing within one year 15,523 17,312
Long-term debt $ 11,539 $ 8,827