Quarterly report pursuant to Section 13 or 15(d)

Securities - Narrative (Details)

v3.19.1
Securities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]      
Fair Value $ 231,613   $ 229,366
Unrealized mark-to-market net gains (losses) 51 $ 41  
Realized net gains (losses) 20 $ (6)  
Other assets      
Debt Securities, Available-for-sale [Line Items]      
Equity securities, fair value 881    
Equity securities, cost 228    
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    
Nonperforming Financing Receivable      
Debt Securities, Available-for-sale [Line Items]      
Fair Value 11   $ 11
Debt securities      
Debt Securities, Available-for-sale [Line Items]      
Accumulated net unrealized loss on AFS debt securities 1,400    
Accumulated other comprehensive income tax expense (benefit) $ (493)