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Investment Securities - Summary of Unrealized Loss Positions on Investment Securities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | $ 2,357 | $ 5,658
Less than Twelve Months, Unrealized Loss | 84 | 122
Twelve Months or Longer, Fair Value | 4,198 | 2,911
Twelve Months or Longer, Unrealized Loss | 777 | 751
Fair Value | 6,555 | 8,569
Unrealized Loss | 861 | 873
Debt Securities | U. S. Treasury obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 1,487
Less than Twelve Months, Unrealized Loss | 0 | 4
Twelve Months or Longer, Fair Value | 0 | 0
Twelve Months or Longer, Unrealized Loss | 0 | 0
Fair Value | 0 | 1,487
Unrealized Loss | 0 | 4
Debt Securities | U.S. Government and GSE Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 181 | 243
Less than Twelve Months, Unrealized Loss | 1 | 5
Twelve Months or Longer, Fair Value | 1,362 | 1,156
Twelve Months or Longer, Unrealized Loss | 290 | 346
Fair Value | 1,543 | 1,399
Unrealized Loss | 291 | 351
Debt Securities | GSE certificates |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 312 | 871
Less than Twelve Months, Unrealized Loss | 5 | 46
Twelve Months or Longer, Fair Value | 843 | 420
Twelve Months or Longer, Unrealized Loss | 141 | 114
Fair Value | 1,155 | 1,291
Unrealized Loss | 146 | 160
Debt Securities | Private Label CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 29 |
Less than Twelve Months, Unrealized Loss | 1 |
Twelve Months or Longer, Fair Value | 0 |
Twelve Months or Longer, Unrealized Loss | 0 |
Fair Value | 29 |
Unrealized Loss | 1 |
Debt Securities | GSE CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 1,835 | 2,219
Less than Twelve Months, Unrealized Loss | 77 | 36
Twelve Months or Longer, Fair Value | 1,312 | 925
Twelve Months or Longer, Unrealized Loss | 304 | 264
Fair Value | 3,147 | 3,144
Unrealized Loss | 381 | 300
Debt Securities | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 61
Less than Twelve Months, Unrealized Loss | 0 | 2
Twelve Months or Longer, Fair Value | 228 | 262
Twelve Months or Longer, Unrealized Loss | 5 | 12
Fair Value | 228 | 323
Unrealized Loss | 5 | 14
Debt Securities | Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 9
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 6 | 7
Twelve Months or Longer, Unrealized Loss | 0 | 0
Fair Value | 6 | 16
Unrealized Loss | 0 | 0
Debt Securities | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 698
Less than Twelve Months, Unrealized Loss | 0 | 27
Twelve Months or Longer, Fair Value | 343 | 97
Twelve Months or Longer, Unrealized Loss | 22 | 3
Fair Value | 343 | 795
Unrealized Loss | 22 | 30
Debt Securities | Foreign notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 20
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 9 | 0
Twelve Months or Longer, Unrealized Loss | 1 | 0
Fair Value | 9 | 20
Unrealized Loss | 1 | 0
Debt Securities | Capital trust notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 46
Less than Twelve Months, Unrealized Loss | 0 | 2
Twelve Months or Longer, Fair Value | 81 | 34
Twelve Months or Longer, Unrealized Loss | 12 | 10
Fair Value | 81 | 80
Unrealized Loss | 12 | 12
Equity Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than Twelve Months, Fair Value | 0 | 4
Less than Twelve Months, Unrealized Loss | 0 | 0
Twelve Months or Longer, Fair Value | 14 | 10
Twelve Months or Longer, Unrealized Loss | 2 | 2
Fair Value | 14 | 14
Unrealized Loss | $ 2 | $ 2

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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