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Deposits - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deposits [Abstract]    
Time Deposits, at or Above FDIC Insurance Limit $ 44,100 $ 32,100
Time deposits mature in 2020 48,300  
Time deposits mature in 2021 2  
Time deposits mature in 2022 0  
Time deposits mature in 2023 0  
Time deposits mature in 2024 0  
Time deposits mature in 2025 and thereafter $ 1