Derivative Financial Instruments - Amounts Related to Fair Value Hedges (Details) - Fair Value Hedges - Interest Rate Contracts - Net interest income - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Net income (expense) recognized	$ 267	$ 263	$ (47)
AFS securities (1)
Derivative Instruments, Gain (Loss) [Line Items]
Amounts related to interest settlements	(48)	(3)	0
Recognized on derivatives	571	29	(16)
Recognized on hedged items	(568)	(41)	8
Net income (expense) recognized	(45)	(15)	(8)
Loans and leases
Derivative Instruments, Gain (Loss) [Line Items]
Amounts related to interest settlements	0	(1)	0
Recognized on derivatives	0	(3)	(21)
Recognized on hedged items	(5)	1	19
Net income (expense) recognized	(5)	(3)	(2)
Long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Amounts related to interest settlements	18	182	(56)
Recognized on derivatives	(136)	831	170
Recognized on hedged items	435	(732)	(151)
Net income (expense) recognized	$ 317	$ 281	$ (37)

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Amount of gain (loss) on derivative instrument designated and qualifying as fair value hedge included in assessment of hedge effectiveness, recognized in earnings.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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