Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Time deposits	$ 5,780	$ 5,800
Time deposits in amounts of $250,000 or more	5,770	5,790
Time deposit liability, uninsured, maturity, three months or less	1,070
Time deposit liability, uninsured, maturity, over three months through six months	2,410
Time deposit liability, uninsured, maturity, over 6 months through 12 months	2,290
Demand deposit overdrafts	1,980	2,270
Foreign
Loans and Leases Receivable Disclosure [Line Items]
Time deposits	$ 80	$ 60