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Segment Information - Reconciliation of Operating Revenues (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	$ 33,821	$ 33,330	$ 101,810	$ 99,107
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	33,247	32,711	100,074	97,371
Corporate and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	659	685	1,982	1,929
Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	$ (85)	$ (66)	$ (246)	$ (193)

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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