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Investment Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Details) $ in Millions | Mar. 31, 2023 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due within one year | $ 136
Due from one to five years | 926
Due from five to ten years | 1,839
Due after ten years | 4,698
Debt securities, available-for-sale, amortized cost, total | 7,599
Agency - commercial |
Debt Securities, Available-for-sale [Line Items] |
Due within one year | 21
Due from one to five years | 175
Due from five to ten years | 328
Due after ten years | 4,609
Debt securities, available-for-sale, amortized cost, total | 5,133
U.S. Treasury and Government Agencies |
Debt Securities, Available-for-sale [Line Items] |
Due within one year | 97
Due from one to five years | 300
Due from five to ten years | 1,377
Due after ten years | 125
Debt securities, available-for-sale, amortized cost, total | 1,899
US States and Political Subdivisions Debt Securities |
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 | 18
Due after ten years | 0
Debt securities, available-for-sale, amortized cost, total | 18
Other Debt Obligations |
Debt Securities, Available-for-sale [Line Items] |
Due within one year | 20
Due from one to five years | 459
Due from five to ten years | 469
Due after ten years | 378
Debt securities, available-for-sale, amortized cost, total | $ 1,326

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