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Deposits - Maturities of Time Deposits (Detail)
$ in Millions
Sep. 30, 2025
USD ($)
Time Deposits By Maturity [Line Items]  
Remainder of 2025 $ 48,470
2026 108,798
2027 7,217
2028 2,937
2029 1,882
2030 1,394
2031 - thereafter 1,632
Total 172,330
U.S.  
Time Deposits By Maturity [Line Items]  
Remainder of 2025 26,103
2026 81,629
2027 6,960
2028 2,722
2029 1,671
2030 1,334
2031 - thereafter 1,626
Total 122,045
Non-U.S.  
Time Deposits By Maturity [Line Items]  
Remainder of 2025 22,367
2026 27,169
2027 257
2028 215
2029 211
2030 60
2031 - thereafter 6
Total $ 50,285