Annual report pursuant to Section 13 and 15(d)

Securities - Narrative (Details)

v3.20.4
Securities - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 234,491 $ 245,639
Other assets    
Debt Securities, Available-for-sale [Line Items]    
Equity securities, fair value 769 891
Equity securities, cost 240 183
Time Deposits Placed and Other Short-term Investments    
Debt Securities, Available-for-sale [Line Items]    
Time deposits placed and other short-term investments 1,600 1,000
Nonperforming Loans    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 20 $ 9
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Accumulated net unrealized gain (loss) on AFS debt securities 4,700  
Accumulated other comprehensive income tax expense (benefit) 1,600  
U.S. Agency And U.S. Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 200,000  
All Non U.S. Agency And Non U.S. Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 34,500