Quarterly report pursuant to Section 13 or 15(d)

Securities - Narrative (Details)

v3.20.2
Securities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]        
Fair Value $ 233,692 $ 233,692   $ 245,639
Debt securities, available for sale, realized gains 4 383 $ 228  
Debt securities, available for sale, realized losses 2 4 112  
Debt securities, available for sale, net gains 2 379 116  
Income tax expense attributable to realized net gains on sales of AFS debt securities 1 95 $ 28  
Other assets        
Debt Securities, Available-for-sale [Line Items]        
Equity securities, fair value 809 809    
Equity securities, cost 261 261    
Time Deposits Placed and Other Short-term Investments        
Debt Securities, Available-for-sale [Line Items]        
Time deposits placed and other short-term investments 385 385    
Nonperforming Loans        
Debt Securities, Available-for-sale [Line Items]        
Fair Value 25 25   $ 9
Debt securities        
Debt Securities, Available-for-sale [Line Items]        
Accumulated net unrealized gain (loss) on AFS debt securities 4,800 4,800    
Accumulated other comprehensive income tax expense (benefit) 1,600 1,600    
U.S. Agency And U.S. Treasury Securities        
Debt Securities, Available-for-sale [Line Items]        
Fair Value 194,800 194,800    
All Non U.S. Agency And Non U.S. Treasury Securities        
Debt Securities, Available-for-sale [Line Items]        
Fair Value $ 38,900 $ 38,900