Derivative Financial Instruments - Fair Value Hedges Basis Adjusments (Details) - Fair Value Hedges - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Available-for-sale Securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset / Liability Basis	[1]	$ 38,773	$ 108,758
Available-for-sale Securities | Items Currently Designated
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		(630)	(400)
Available-for-sale Securities | Discontinued Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		(4)	(150)
Loans and leases
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset / Liability Basis		353	382
Loans and leases | Items Currently Designated
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		0	0
Loans and leases | Discontinued Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		10	12
Long-term debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset / Liability Basis		25,378	27,361
Long-term debt | Items Currently Designated
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		(780)	(137)
Long-term debt | Discontinued Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		$ 218	$ 629

[1] The amortized cost of AFS securities was $46.2 billion at December 31, 2022 and $110.6 billion at December 31, 2021.