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Investment Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-sale [Line Items] |  |
Due within one year | $ 446 |
Due from one to five years | 560 |
Due from five to ten years | 1,597 |
Due after ten years | 6,542 |
Amortized Cost | 9,145 |
Mortgage- Related Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due within one year | 0 |
Due from one to five years | 178 |
Due from five to ten years | 316 |
Due after ten years | 6,541 |
Amortized Cost | 7,035 | $ 5,242
U.S. Government and GSE Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due within one year | 448 |
Due from one to five years | 50 |
Due from five to ten years | 1,502 |
Due after ten years | 96 |
Amortized Cost | 2,096 |
State, County, and Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due within one year | 0 |
Due from one to five years | 0 |
Due from five to ten years | 6 |
Due after ten years | 0 |
Amortized Cost | 6 |
Other Debt Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due within one year | 0 |
Due from one to five years | 353 |
Due from five to ten years | 105 |
Due after ten years | 345 |
Amortized Cost | $ 803 |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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