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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Unrealized losses on securities transferred to held to maturity during the period, tax	$ (111)	$ 0	$ (111)	$ 0
Amortization of unrealized losses on securities transferred to held to maturity, tax	0	0	0	0
OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityBeforeAdjustmentTax	111	0	111	0
Unrealized holding gains (losses) on available for sale securities, tax	298	(203)	193	(177)
Reclassification adjustments for securities gains (losses) realized in net income, tax	(20)	0	(45)	0
Cash flow hedging gain (loss), tax	121	(93)	(16)	(169)
Cash flow hedging gain (loss) reclassification, tax	(28)	(21)	(88)	(33)
Net actuarial gains and losses arising during the period, tax	0	0	0	0
Reclassification adjustments for amortization of actuarial loss and settlements realized in net income, and other, tax	$ (1)	$ (3)	$ (5)	$ (6)

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OCIDebtSecuritiesAvailableForSaleUnrealizedGainLossTransferredToHeldToMaturityArisingDuringPeriodTax

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Other Comprehensive Income (Loss), AFS Transfer To Held To Maturity, Tax

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Amount of tax expense (benefit) on adjustment from accumulated other comprehensive income (loss) for amortization of gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from transfer to investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 10B
-Subparagraph (d)
-Publisher FASB
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Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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