Annual report pursuant to Section 13 and 15(d)

Securities - Narrative (Details)

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Securities - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 299,178 $ 234,491
Other assets    
Debt Securities, Available-for-sale [Line Items]    
Equity securities, fair value 513 769
Equity securities, cost 266 240
Time Deposits Placed and Other Short-term Investments    
Debt Securities, Available-for-sale [Line Items]    
Time deposits placed and other short-term investments 707 1,600
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Accumulated net unrealized gain (loss) on AFS debt securities 2,500  
Accumulated other comprehensive income tax expense (benefit) 817  
U.S. Agency And U.S. Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 268,500 200,000
All Non U.S. Agency And Non U.S. Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 30,700 $ 34,500