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Investment Debt Securities (Held-to-maturities debt securities) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost and Net Carrying Amount $ 1,171 $ 1,552
Gross Unrecognized Holding Gains 2 4
Gross Unrecognized Holding (Losses) (10) (9)
Fair Value 1,163 1,547
U.S. Government & other government related    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost and Net Carrying Amount 1,026 1,385
Gross Unrecognized Holding Gains 1 2
Gross Unrecognized Holding (Losses) (9) (9)
Fair Value 1,018 1,378
GSE MBS    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost and Net Carrying Amount 126 137
Gross Unrecognized Holding Gains 1 2
Gross Unrecognized Holding (Losses) (1) 0
Fair Value 126 139
Government Guaranteed MBS    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost and Net Carrying Amount 14 24
Gross Unrecognized Holding Gains 0 0
Gross Unrecognized Holding (Losses) 0 0
Fair Value 14 24
Other    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost and Net Carrying Amount 5 6
Gross Unrecognized Holding Gains 0 0
Gross Unrecognized Holding (Losses) 0 0
Fair Value $ 5 $ 6