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Derivative and Hedging Activities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest , loans and leases held-for-sale | $ 1 |
Hedged debt, carrying amount | 6,000 |
Fair value of interest rate fair value hedging instruments | 2 |
Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional amount | 2,000 |
Interest rate swaps | Derivatives designated hedging instruments: |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional amount | 2,000 |
Interest rate swap on FHLB advances | Derivatives designated hedging instruments: | Cash flow hedging |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, notional amount | 5,500 | $ 2,300
Unrealized gains on cash flow hedges: |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Unrealized losses on derivatives classified as cash flow hedges | 19 | $ 52
Amount of gain (loss), net of tax, to be reclassified during the next 12 months | $ (81) |

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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