Other Liabilities - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Other Liabilities Disclosure [Abstract]
Operating lease costs	$ 122,000,000	$ 119,000,000	$ 356,000,000	$ 361,000,000
Lease payments related to operating lease arrangements not yet commenced	1,200,000,000		1,200,000,000
Liabilities held for sale	0		0		$ 0
Contract liabilities	124,000,000		124,000,000		0
Commitments related to qualified affordable housing projects	$ 1,960,000,000		$ 1,960,000,000		$ 2,150,000,000

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of lease cost recognized by lessee for lease contract.

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Amount classified as liabilities attributable to disposal group held for sale or disposed of.

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Amount of commitment and contingent commitment, including amount of delayed equity contribution, for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, commitment and contingent commitment related to investment under tax credit program not meeting condition for accounting under proportional amortization method.

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Amount of unrecorded obligation to transfer funds in future for fixed or minimum amount or quantity of product and service at fixed or minimum price. Includes, but is not limited to, lease not yet commenced and take-or-pay and throughput contracts.

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