Lease Obligations - Lessee - Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lease Cost [Line Items]
Total finance lease costs	$ 27	$ 24	$ 24
Total operating lease costs	117	116	110
Total lease costs	144	140	134
Impairment losses and termination charges	1	2	2
Net occupancy and equipment expense
Lease Cost [Line Items]
Amortization of ROU assets	21	19	19
Interest on long-term debt
Lease Cost [Line Items]
Interest on lease liabilities	6	5	5
Net occupancy expense
Lease Cost [Line Items]
Operating lease cost	89	87	84
Short-term lease cost	1	2	1
Variable lease cost	30	29	28
Sublease income	$ (3)	(2)	(3)
Impairment losses and termination charges		$ 2	$ 2