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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, 2019
Mar. 31, 2018
Mortgage Servicing Rights [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning of Period Balance $ 2,791 $ 2,645
Net Gains (Losses) Included in Net Income (214) 33
Purchases 1 2
Sales 0 0
Issuances 78 100
Settlements 0 0
End of Period Balance 2,656 2,780
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period (214) 33
Derivative [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning of Period Balance 80 107
Net Gains (Losses) Included in Net Income 363 (251)
Purchases 1 1
Sales (7) (6)
Issuances 0 0
Settlements 18 17
End of Period Balance 455 (132)
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period $ 424 $ (212)