Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Payments:
Interest	$ 4,871	$ 3,776	$ 869
Income taxes	195	655	272
Transfers:
Portfolio loans and leases to loans and leases held for sale	422	513	105
Loans and leases held for sale to portfolio loans and leases	4	6	409
Portfolio loans and leases to OREO	23	12	8
Bank premises and equipment to OREO	9	30	24
Available-for-sale debt securities to held-to-maturity securities	11,593	0	0
Supplemental Disclosures:
Net additions to lease liabilities under operating leases	74	72	152
Net additions (reductions) to lease liabilities under finance leases	$ 44	$ (6)	$ 27