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Investment Securities - Summary of Unrealized Loss Positions on Investment Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value $ 1 $ 2,357
Less than Twelve Months, Unrealized Loss 0 84
Twelve Months or Longer, Fair Value 5,927 4,198
Twelve Months or Longer, Unrealized Loss 734 777
Fair Value 5,928 6,555
Unrealized Loss 734 861
Other Debt Securities: | U.S. Government agency and GSE obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 0 181
Less than Twelve Months, Unrealized Loss 0 1
Twelve Months or Longer, Fair Value 1,254 1,362
Twelve Months or Longer, Unrealized Loss 248 290
Fair Value 1,254 1,543
Unrealized Loss 248 291
Other Debt Securities: | GSE certificates    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 0 312
Less than Twelve Months, Unrealized Loss 0 5
Twelve Months or Longer, Fair Value 1,104 843
Twelve Months or Longer, Unrealized Loss 123 141
Fair Value 1,104 1,155
Unrealized Loss 123 146
Other Debt Securities: | Private Label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 0 29
Less than Twelve Months, Unrealized Loss 0 1
Twelve Months or Longer, Fair Value 17 0
Twelve Months or Longer, Unrealized Loss 0 0
Fair Value 17 29
Unrealized Loss 0 1
Other Debt Securities: | GSE collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 1 1,835
Less than Twelve Months, Unrealized Loss 0 77
Twelve Months or Longer, Fair Value 2,958 1,312
Twelve Months or Longer, Unrealized Loss 341 304
Fair Value 2,959 3,147
Unrealized Loss 341 381
Other Debt Securities: | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 0 0
Less than Twelve Months, Unrealized Loss 0 0
Twelve Months or Longer, Fair Value 175 228
Twelve Months or Longer, Unrealized Loss 3 5
Fair Value 175 228
Unrealized Loss 3 5
Other Debt Securities: | Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 0 0
Less than Twelve Months, Unrealized Loss 0 0
Twelve Months or Longer, Fair Value 6 6
Twelve Months or Longer, Unrealized Loss 0 0
Fair Value 6 6
Unrealized Loss 0 0
Other Debt Securities: | Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 0 0
Less than Twelve Months, Unrealized Loss 0 0
Twelve Months or Longer, Fair Value 356 343
Twelve Months or Longer, Unrealized Loss 7 22
Fair Value 356 343
Unrealized Loss 7 22
Other Debt Securities: | Foreign notes    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 0 0
Less than Twelve Months, Unrealized Loss 0 0
Twelve Months or Longer, Fair Value 10 9
Twelve Months or Longer, Unrealized Loss 0 1
Fair Value 10 9
Unrealized Loss 0 1
Other Debt Securities: | Capital trust notes    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 0 0
Less than Twelve Months, Unrealized Loss 0 0
Twelve Months or Longer, Fair Value 33 81
Twelve Months or Longer, Unrealized Loss 10 12
Fair Value 33 81
Unrealized Loss 10 12
Equity securities:    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 0 0
Less than Twelve Months, Unrealized Loss 0 0
Twelve Months or Longer, Fair Value 14 14
Twelve Months or Longer, Unrealized Loss 2 2
Fair Value 14 14
Unrealized Loss $ 2 $ 2