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Derivative and Hedging Activities - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |
Net unrealized gain on cash flow hedges, net of tax of $(6) and $(20), respectively | $ 10 | $ 52
Interest , loans and leases held-for-sale | 24 | 6
Amount of hedged item | 6,100 |
Fair value of interest rate fair value hedging instruments | 9 |
Amount of gain (loss), net of tax, to be reclassified during the next 12 months | 98 |
Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional amount | 2,000 |
Amount of hedged item | 2,000 |
Interest rate swaps | Derivatives designated as cash flow hedging instruments: | Cash flow hedging |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, notional amount | $ 5,500 | $ 3,800

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- Definition Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 + Details
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- Definition Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C + Details
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