Derivative Financial Instruments - Fair Value Hedges Basis Adjusments (Details) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities	Other Liabilities
Fair Value Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Liability, Long Term Debt, Fair Value Hedge		$ 27,385	$ 25,378
Fair Value Hedges | Items Currently Designated
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		(303)	(780)
Fair Value Hedges | Discontinued Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		(134)	218
Fair Value Hedges | Available-for-sale Securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset / Liability Basis	[1]	38,761	38,773
Fair Value Hedges | Available-for-sale Securities | Items Currently Designated
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		(534)	(630)
Fair Value Hedges | Available-for-sale Securities | Discontinued Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		(4)	(4)
Fair Value Hedges | Loans and leases
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedged Asset / Liability Basis		350	353
Fair Value Hedges | Loans and leases | Items Currently Designated
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		0	0
Fair Value Hedges | Loans and leases | Discontinued Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge Basis Adjustment		$ 9	$ 10

[1] The amortized cost of AFS securities was $45.5 billion at March 31, 2023 and $46.2 billion at December 31, 2022.