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Derivatives - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, Notional Amount | $ 7,141,000,000 |  | $ 7,141,000,000 |  | $ 12,363,000,000
Derivative, Collateral, Right to Reclaim Cash | 26,000,000 |  | 26,000,000 |  | 25,000,000
Cash collateral held | 57,000,000 |  | 57,000,000 |  | 49,000,000
Securities Received as Collateral | 0 |  | 0 |  | 0
Collateral Securities Repledged, Delivered, or Used | 0 |  | 0 |  | 0
Collateral Pledged |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, Collateral, Right to Reclaim Cash | 10,000,000 |  | 10,000,000 |  | 16,000,000
Asset Pledged as Collateral [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, Collateral, Right to Reclaim Securities | 11,000,000 |  | 11,000,000 |  | 14,000,000
Asset Pledged as Collateral [Member] | Over the Counter [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, Collateral, Right to Reclaim Securities | 96,000,000 |  | 96,000,000 |  | 112,000,000
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring | 0 | $ 0 | 0 | $ 0 |
AOCI Attributable to Parent [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 35,000,000 |  |
Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, Notional Amount | 2,382,000,000 |  | 2,382,000,000 |  | 8,269,000,000
Interest rate swaps | Not Designated as Hedging Instrument |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, Notional Amount | 344,000,000 |  | 344,000,000 |  | $ 6,600,000,000
SOFR Plus Two Point One Two Five Percent Plus Zero Point Two Six One Six One Percent Junior Subordinated Notes Due Two Thousand Sixty Seven |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Junior Subordinated Debentures | $ 500,000,000 |  | $ 500,000,000 |  |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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