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Investment Securities - Summary of Unrealized Loss Positions on Investment Securities (Details)
$ in Millions
Mar. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 604,000,000 609,000,000
Fair Value    
Less than Twelve Months $ 2,973 $ 1,674
Twelve Months or Longer 5,505 5,592
Total 8,478 7,266
Unrealized Loss    
Less than Twelve Months 10 3
Twelve Months or Longer 825 929
Total $ 835 $ 932
Debt Securities | GSE CMOs    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 221,000,000 223,000,000
Fair Value    
Less than Twelve Months $ 1,869 $ 1,636
Twelve Months or Longer 2,829 2,822
Total 4,698 4,458
Unrealized Loss    
Less than Twelve Months 7 3
Twelve Months or Longer 398 444
Total $ 405 $ 447
Debt Securities | U.S. Government agency and GSE obligations    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 33,000,000 33,000,000
Fair Value    
Less than Twelve Months $ 0 $ 0
Twelve Months or Longer 1,241 1,203
Total 1,241 1,203
Unrealized Loss    
Less than Twelve Months 0 0
Twelve Months or Longer 261 299
Total $ 261 $ 299
Debt Securities | GSE certificates    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 328,000,000 328,000,000
Fair Value    
Less than Twelve Months $ 11 $ 38
Twelve Months or Longer 1,045 1,040
Total 1,056 1,078
Unrealized Loss    
Less than Twelve Months 0 0
Twelve Months or Longer 145 167
Total $ 145 $ 167
Debt Securities | U. S. Treasury obligations    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 0  
Fair Value    
Less than Twelve Months $ 1,001  
Twelve Months or Longer 0  
Total 1,001  
Unrealized Loss    
Less than Twelve Months 1  
Twelve Months or Longer 0  
Total $ 1  
Debt Securities | Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 8,000,000 11,000,000
Fair Value    
Less than Twelve Months $ 73 $ 0
Twelve Months or Longer 175 308
Total 248 308
Unrealized Loss    
Less than Twelve Months 2 0
Twelve Months or Longer 8 6
Total $ 10 $ 6
Debt Securities | Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 5,000,000 5,000,000
Fair Value    
Less than Twelve Months $ 15 $ 0
Twelve Months or Longer 150 154
Total 165 154
Unrealized Loss    
Less than Twelve Months 0 0
Twelve Months or Longer 3 2
Total $ 3 $ 2
Debt Securities | Capital trust notes    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 5,000,000 5,000,000
Fair Value    
Less than Twelve Months $ 0 $ 0
Twelve Months or Longer 34 33
Total 34 33
Unrealized Loss    
Less than Twelve Months 0 0
Twelve Months or Longer 9 10
Total $ 9 $ 10
Debt Securities | Private Label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 2,000,000 2,000,000
Fair Value    
Less than Twelve Months $ 4 $ 0
Twelve Months or Longer 16 17
Total 20 17
Unrealized Loss    
Less than Twelve Months 0 0
Twelve Months or Longer 1 1
Total $ 1 $ 1
Debt Securities | Foreign Notes    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 1,000,000 1,000,000
Fair Value    
Less than Twelve Months $ 0 $ 0
Twelve Months or Longer 10 10
Total 10 10
Unrealized Loss    
Less than Twelve Months 0 0
Twelve Months or Longer 0 0
Total $ 0 $ 0
Debt Securities | Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Number of Debt Securities | security 1,000,000 1,000,000
Fair Value    
Less than Twelve Months $ 0 $ 0
Twelve Months or Longer 5 5
Total 5 5
Unrealized Loss    
Less than Twelve Months 0 0
Twelve Months or Longer 0 0
Total $ 0 $ 0