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Securities - Credit Risk Profile of Held-to-maturity Securities (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity $ 8,983
Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 8,983
Non-Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 0
US Government-sponsored enterprises [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 1,917
US Government-sponsored enterprises [Member] | Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 1,917
US Government-sponsored enterprises [Member] | Non-Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 0
US Government agency issued or guaranteed [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 7,054
US Government agency issued or guaranteed [Member] | Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 7,054
US Government agency issued or guaranteed [Member] | Non-Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 0
Obligations of U.S. states and political subdivisions [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 10
Obligations of U.S. states and political subdivisions [Member] | Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 10
Obligations of U.S. states and political subdivisions [Member] | Non-Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 0
Asset-backed securities collateralized by residential mortgages [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 2
Asset-backed securities collateralized by residential mortgages [Member] | Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity 2
Asset-backed securities collateralized by residential mortgages [Member] | Non-Investment Grade [Member]  
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]  
Securities held-to-maturity $ 0