Lease Obligations - Lessee - Lease Assets and Lease Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease right-of-use assets	$ 479	$ 427
Operating lease right-of-use assets [Extensible List]	Other assets	Other assets
Finance lease right-of-use assets	$ 158	$ 145
Finance lease, right-of-use assets [Extensible List]	Bank premises and equipment	Bank premises and equipment
Total right-of-use assets	$ 637	$ 572
Operating lease liabilities	$ 568	$ 520
Operating lease liabilities [Extensible List]	Accrued Liabilities [Member]	Accrued Liabilities [Member]
Finance lease liabilities	$ 163	$ 149
Finance lease liabilities [Extensible List]	Long-term debt	Long-term debt
Total lease liabilities	$ 731	$ 669
Operating lease right of use asset, accumulated amortization	239	198
Finance lease right of use asset, accumulated amortization	$ 61	$ 47