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Deposits - Maturities of Time Deposits (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Time Deposits By Maturity [Line Items]    
Remainder of 2019 $ 12,613  
2020 30,547  
2021 7,668  
2022 7,612  
2023 5,886  
2024 4,170  
2025 - thereafter 4,295  
Total 72,791 $ 62,338
U.S. [Member]    
Time Deposits By Maturity [Line Items]    
Remainder of 2019 4,607  
2020 22,802  
2021 7,629  
2022 7,532  
2023 5,831  
2024 4,050  
2025 - thereafter 3,377  
Total 55,828  
Non-U.S. [Member]    
Time Deposits By Maturity [Line Items]    
Remainder of 2019 8,006  
2020 7,745  
2021 39  
2022 80  
2023 55  
2024 120  
2025 - thereafter 918  
Total $ 16,963