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Fair Values of Assets and Liabilities - Changes in Fair Value for All Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mortgage Servicing Rights [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning of Period Balance $ 2,953 $ 2,210
Net Gains (Losses) Included in Net Income 238 242
Purchases 3 16
Sales 1  
Issuances 237 319
End of Period Balance 3,432 2,787
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period 238 242
Available-for-Sale Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning of Period Balance 8 8
End of Period Balance 8 8
Available-for-Sale Securities [Member] | Obligations of State and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning of Period Balance 1 1
End of Period Balance 1 1
Derivative [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning of Period Balance 799 2,326
Net Gains (Losses) Included in Net Income (1,867) (935)
Purchases 11 2
Sales (1)  
Settlements 47 (237)
End of Period Balance (1,011) 1,156
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period (1,697) (900)
Asset-Backed Securities [Member] | Available-for-Sale Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning of Period Balance 7 7
End of Period Balance $ 7 $ 7