Quarterly report pursuant to Section 13 or 15(d)

Securities - Narrative (Details)

v3.20.1
Securities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Fair Value $ 206,221   $ 245,639
Debt securities, available for sale, realized gains 316 $ 117  
Debt securities, available for sale, realized losses 1 111  
Debt securities, available for sale, net gains 315 $ 6  
Income tax expense attributable to realized net gains on sales of AFS debt securities 79    
Other assets      
Debt Securities, Available-for-sale [Line Items]      
Equity securities, fair value 835    
Equity securities, cost 222    
Time Deposits Placed and Other Short-term Investments      
Debt Securities, Available-for-sale [Line Items]      
Time deposits placed and other short-term investments 1,100    
Nonperforming Loans      
Debt Securities, Available-for-sale [Line Items]      
Fair Value 8   $ 9
Debt securities      
Debt Securities, Available-for-sale [Line Items]      
Accumulated net unrealized gain (loss) on AFS debt securities 6,200    
Accumulated other comprehensive income tax expense (benefit) 2,000    
U.S. Agency And U.S. Treasury Securities      
Debt Securities, Available-for-sale [Line Items]      
Fair Value 168,300    
All Non U.S. Agency And Non U.S. Treasury Securities      
Debt Securities, Available-for-sale [Line Items]      
Fair Value $ 37,900