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Fair Value Measurement - Nonrecurring Fair Value Measurements (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment $ 0 $ 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment 239,525 258,696
Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment 294 294
Other assets 55 103
Total assets 349 397
Nonrecurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment 0 0
Other assets 0 0
Total assets 0 0
Nonrecurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment 294 294
Other assets 55 103
Total assets 349 397
Equity investments accounted for under measurement alternative 14 5
Foreclosed property and repossessed assets, fair value disclosure 35 61
Long lived assets held for sale $ 6 $ 37