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Investment Securities - Gross Unrealized Losses and Fair Value of Investment Securities (Details) $ in Millions | Sep. 30, 2025 USD ($)
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Schedule Of Fair Value And Gross Unrealized Losses [Line Items] |
Less Than 12 Months, Fair Value | $ 10,386
Less Than 12 Months, Unrealized Losses | (49)
12 Months or Greater, Fair Value | 49,728
12 Months or Greater, Unrealized Losses | (4,998)
Total, Fair Value | 60,114
Total, Unrealized Losses | (5,047)
U.S. Treasury and agencies |
Schedule Of Fair Value And Gross Unrealized Losses [Line Items] |
Less Than 12 Months, Fair Value | 4,398
Less Than 12 Months, Unrealized Losses | (4)
12 Months or Greater, Fair Value | 20,288
12 Months or Greater, Unrealized Losses | (1,494)
Total, Fair Value | 24,686
Total, Unrealized Losses | (1,498)
Residential mortgage-backed securities |
Schedule Of Fair Value And Gross Unrealized Losses [Line Items] |
Less Than 12 Months, Fair Value | 4,825
Less Than 12 Months, Unrealized Losses | (30)
12 Months or Greater, Fair Value | 13,924
12 Months or Greater, Unrealized Losses | (1,459)
Total, Fair Value | 18,749
Total, Unrealized Losses | (1,489)
Commercial mortgage-backed securities | Agency |
Schedule Of Fair Value And Gross Unrealized Losses [Line Items] |
Less Than 12 Months, Fair Value | 0
Less Than 12 Months, Unrealized Losses | 0
12 Months or Greater, Fair Value | 7,694
12 Months or Greater, Unrealized Losses | (961)
Total, Fair Value | 7,694
Total, Unrealized Losses | (961)
Commercial mortgage-backed securities | Non-agency |
Schedule Of Fair Value And Gross Unrealized Losses [Line Items] |
Less Than 12 Months, Fair Value | 0
Less Than 12 Months, Unrealized Losses | 0
12 Months or Greater, Fair Value | 7
12 Months or Greater, Unrealized Losses | 0
Total, Fair Value | 7
Total, Unrealized Losses | 0
Asset-backed securities |
Schedule Of Fair Value And Gross Unrealized Losses [Line Items] |
Less Than 12 Months, Fair Value | 291
Less Than 12 Months, Unrealized Losses | 0
12 Months or Greater, Fair Value | 0
12 Months or Greater, Unrealized Losses | 0
Total, Fair Value | 291
Total, Unrealized Losses | 0
Obligations of state and political subdivisions |
Schedule Of Fair Value And Gross Unrealized Losses [Line Items] |
Less Than 12 Months, Fair Value | 872
Less Than 12 Months, Unrealized Losses | (15)
12 Months or Greater, Fair Value | 7,815
12 Months or Greater, Unrealized Losses | (1,084)
Total, Fair Value | 8,687
Total, Unrealized Losses | $ (1,099)

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