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Segment Information - Reconciliation of Operating Revenues (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	$ 33,336	$ 34,241	$ 98,844	$ 101,584
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	32,784	33,677	97,176	99,908
Corporate and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	618	627	1,856	1,868
Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	$ (66)	$ (63)	$ (188)	$ (192)

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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