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Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Interest expense	$ 129	$ 122	$ 373	$ 369
Operating Segments
Segment Reporting Information [Line Items]
Interest income	2	25	2	53
Interest expense	$ 3	$ 3	$ 10	$ 9

Amount of the cost of borrowed funds accounted for as interest expense.

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.