Lease Obligations - Lessee - Lease Assets and Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease right-of-use assets	$ 511	$ 508
Finance lease right-of-use assets	126	150
Total right-of-use assets	637	658
Operating lease liabilities	601	599
Finance lease liabilities	134	156
Total lease liabilities	735	755
Operating lease right of use asset, accumulated amortization	292	255
Finance lease right of use asset, accumulated amortization	$ 77	$ 66
Operating lease right-of-use assets [Extensible List]	Other assets	Other assets
Finance lease, right-of-use assets [Extensible List]	Bank premises and equipment	Bank premises and equipment
Operating lease liabilities [Extensible List]	Accrued Liabilities [Member]	Accrued Liabilities [Member]
Finance lease liabilities [Extensible List]	Long-term debt	Long-term debt