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Investment Securities - Summary of Unrealized Loss Positions on Investment Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value $ 1,360 $ 2,357
Less than Twelve Months, Unrealized Loss 28 84
Twelve Months or Longer, Fair Value 5,531 4,198
Twelve Months or Longer, Unrealized Loss 899 777
Fair Value 6,891 6,555
Unrealized Loss 927 861
Other Debt Securities: | U. S. Treasury obligations    
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 0 0
Twelve Months or Longer, Unrealized Loss 0 0
Fair Value 0 0
Unrealized Loss 0 0
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 1,441 1,362
Twelve Months or Longer, Unrealized Loss 311 290
Fair Value 1,441 1,543
Unrealized Loss 311 291
Other Debt Securities: | GSE certificates    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 53 312
Less than Twelve Months, Unrealized Loss 1 5
Twelve Months or Longer, Fair Value 1,087 843
Twelve Months or Longer, Unrealized Loss 163 141
Fair Value 1,140 1,155
Unrealized Loss 164 146
Other Debt Securities: | Private Label CMOs    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 15 29
Less than Twelve Months, Unrealized Loss 0 1
Twelve Months or Longer, Fair Value 3 0
Twelve Months or Longer, Unrealized Loss 0 0
Fair Value 18 29
Unrealized Loss 0 1
Other Debt Securities: | GSE CMOs    
Debt Securities, Available-for-sale [Line Items]    
Less than Twelve Months, Fair Value 1,292 1,835
Less than Twelve Months, Unrealized Loss 27 77
Twelve Months or Longer, Fair Value 2,340 1,312
Twelve Months or Longer, Unrealized Loss 385 304
Fair Value 3,632 3,147
Unrealized Loss 412 381
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 207 228
Twelve Months or Longer, Unrealized Loss 4 5
Fair Value 207 228
Unrealized Loss 4 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 341 343
Twelve Months or Longer, Unrealized Loss 24 22
Fair Value 341 343
Unrealized Loss 24 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 82 81
Twelve Months or Longer, Unrealized Loss 10 12
Fair Value 82 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