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Deposits - Maturities of Time Deposits (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Time Deposits By Maturity [Line Items]    
Remainder of 2020 $ 16,606  
2021 39,157  
2022 9,949  
2023 6,559  
2024 4,298  
2025 2,354  
2026 - thereafter 3,153  
Total 82,076 $ 71,269
U.S. [Member]    
Time Deposits By Maturity [Line Items]    
Remainder of 2020 10,905  
2021 30,803  
2022 9,864  
2023 6,439  
2024 4,168  
2025 2,104  
2026 - thereafter 2,200  
Total 66,483  
Non-U.S. [Member]    
Time Deposits By Maturity [Line Items]    
Remainder of 2020 5,701  
2021 8,354  
2022 85  
2023 120  
2024 130  
2025 250  
2026 - thereafter 953  
Total $ 15,593