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Fair Values of Assets and Liabilities - Losses Recognized Related to Nonrecurring Fair Value Measurements of Individual Assets or Portfolios (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Loans [Member]        
Fair Value Assets Measured On Nonrecurring Basis Losses Recognized [Line Items]        
Losses recognized related to nonrecurring fair value measurements $ 184 $ 20 $ 244 $ 93
Other Assets [Member]        
Fair Value Assets Measured On Nonrecurring Basis Losses Recognized [Line Items]        
Losses recognized related to nonrecurring fair value measurements $ 13 $ 6 $ 19 $ 12