Quarterly report pursuant to Section 13 or 15(d)

Securities - Narrative (Details)

v3.21.2
Securities - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 278,181 $ 234,491
Other assets    
Debt Securities, Available-for-sale [Line Items]    
Equity securities, fair value 616 769
Equity securities, cost 270 240
Time Deposits Placed and Other Short-term Investments    
Debt Securities, Available-for-sale [Line Items]    
Time deposits placed and other short-term investments 1,500 1,600
Nonperforming Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 19 20
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Accumulated net unrealized gain (loss) on AFS debt securities 3,500  
Accumulated other comprehensive income tax expense (benefit) 1,200  
U.S. Agency And U.S. Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 241,400 200,000
All Non U.S. Agency And Non U.S. Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 36,800 $ 34,500