Debt - Assets and Liabilities Related to Asset-backed Debt Arrangements (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Prepaid expenses and other	$ 8,251	$ 8,358
Other assets	17,603	17,260
Accounts payable and accrued liabilities	19,273	23,977
Debt maturing within one year	12,081	9,963
Long-term debt	140,772	140,676
Variable Interest Entity, Primary Beneficiary
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Accounts receivable, net	14,255	13,906
Prepaid expenses and other	1,573	1,409
Other assets	11,011	9,894
Accounts payable and accrued liabilities	23	22
Debt maturing within one year	6,409	6,809
Long-term debt	$ 14,426	$ 13,199