Quarterly report pursuant to Section 13 or 15(d)

Securities - Narrative (Details)

v3.20.2
Securities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]          
Fair Value $ 190,432   $ 190,432   $ 245,639
Debt securities, available for sale, realized gains 63 $ 110 379 $ 227  
Debt securities, available for sale, realized losses 1 1 2 112  
Debt securities, available for sale, net gains 62 109 377 115  
Income tax expense attributable to realized net gains on sales of AFS debt securities 15 $ 26 94 $ 28  
Other assets          
Debt Securities, Available-for-sale [Line Items]          
Equity securities, fair value 798   798    
Equity securities, cost 225   225    
Time Deposits Placed and Other Short-term Investments          
Debt Securities, Available-for-sale [Line Items]          
Time deposits placed and other short-term investments 1,200   1,200    
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 153,900   153,900    
All Non U.S. Agency And Non U.S. Treasury Securities          
Debt Securities, Available-for-sale [Line Items]          
Fair Value $ 36,600   $ 36,600