Quarterly report pursuant to Section 13 or 15(d)

Securities - Narrative (Details)

v3.19.2
Securities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]          
Fair Value $ 235,979   $ 235,979   $ 229,366
Debt securities, available-for-sale, realized gain 110 $ 0 227 $ 0  
Debt securities, available-for-sale, realized loss 1 $ 0 112 $ 0  
Debt securities, available-for-sale, net realized gain (loss) 109   115    
Debt securities, available-for-sale, income tax expense in realized gain (loss) 26   28    
Other assets          
Debt Securities, Available-for-sale [Line Items]          
Equity securities, fair value 861   861    
Equity securities, cost 184   184    
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 Financing Receivable          
Debt Securities, Available-for-sale [Line Items]          
Fair Value 11   11   $ 11
Debt securities          
Debt Securities, Available-for-sale [Line Items]          
Accumulated net unrealized loss on AFS debt securities 894   894    
Accumulated other comprehensive income tax expense (benefit) $ 278   $ 278