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Allowance for Loan and Lease Losses - Components of Allowance for Loan and Lease Losses by Impairment Methodology (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Allowance for loan and lease losses by impairment methodology:        
Collectively evaluated $ 6,943 $ 6,882    
Asset-specific 370 338    
Total allowance for loan and lease losses 7,313 7,220    
Loans held for investment by impairment methodology:        
Collectively evaluated 238,209 243,920    
Asset-specific 1,938 1,844    
Loans held for investment $ 240,273 $ 245,899 $ 248,256  
Allowance as a percentage of period-end loans held for investment 3.04% 2.94%    
Credit Card        
Allowance for loan and lease losses by impairment methodology:        
Collectively evaluated $ 5,298 $ 5,258    
Asset-specific 270 277    
Total allowance for loan and lease losses 5,568 5,535 5,726 $ 5,648
Loans held for investment by impairment methodology:        
Collectively evaluated 108,979 115,505    
Asset-specific 857 855    
Loans held for investment $ 109,836 $ 116,361    
Allowance as a percentage of period-end loans held for investment 5.07% 4.76%    
Consumer Banking        
Allowance for loan and lease losses by impairment methodology:        
Collectively evaluated $ 1,030 $ 1,021    
Asset-specific 32 27    
Total allowance for loan and lease losses 1,062 1,048 1,253 1,242
Loans held for investment by impairment methodology:        
Collectively evaluated 58,847 58,808    
Asset-specific 398 393    
Loans held for investment $ 59,248 $ 59,205    
Allowance as a percentage of period-end loans held for investment 1.79% 1.77%    
Commercial Banking        
Allowance for loan and lease losses by impairment methodology:        
Collectively evaluated $ 615 $ 603    
Asset-specific 68 34    
Total allowance for loan and lease losses 683 637 587 611
Loans held for investment by impairment methodology:        
Collectively evaluated 70,383 69,607    
Asset-specific 683 596    
Loans held for investment $ 71,189 $ 70,333    
Allowance as a percentage of period-end loans held for investment 0.96% 0.91%    
Other        
Allowance for loan and lease losses by impairment methodology:        
Total allowance for loan and lease losses     $ 1 $ 1
PCI loans        
Loans held for investment by impairment methodology:        
Loans held for investment $ 126 $ 135    
PCI loans | Credit Card        
Loans held for investment by impairment methodology:        
Loans held for investment 0 1    
PCI loans | Consumer Banking        
Loans held for investment by impairment methodology:        
Loans held for investment 3 4    
PCI loans | Commercial Banking        
Loans held for investment by impairment methodology:        
Loans held for investment $ 123 $ 130