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Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Interest expense	$ 113	$ 117
Operating Segments
Segment Reporting Information [Line Items]
Interest income	4
Interest expense	$ 3	$ 3

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.