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Fair Value Measurement - Nonrecurring Fair Value Measurements (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale $ 251  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment 0 $ 0
Loans held for sale 149 1,218
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment 258,696 241,556
Loans held for sale 0 0
Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment 294 129
Loans held for sale   38
Other assets 103 100
Total assets 397 267
Nonrecurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment 0 0
Loans held for sale   38
Other assets 0 0
Total assets 0 38
Nonrecurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net loans held for investment 294 129
Loans held for sale   0
Other assets 103 100
Total assets 397 229
Equity investments accounted for under measurement alternative 5 24
Foreclosed property and repossessed assets, fair value disclosure 61 57
Long lived assets held for sale $ 37 $ 19