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Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Interest expense	$ 503	$ 490	$ 539
Operating Segments
Segment Reporting Information [Line Items]
Interest income	12	72	2
Interest expense	$ 14	$ 13	15
Operating Segments \| Charges And Credits
Segment Reporting Information [Line Items]
Interest expense			$ 10

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.