Annual report pursuant to Section 13 and 15(d)

Securities - Narrative (Details)

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Securities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]      
Fair Value $ 245,639 $ 229,366  
Credit-related OTTI losses 24 33 $ 41
Cumulative credit losses on debt securities held 85 120 $ 274
Other assets      
Debt Securities, Available-for-sale [Line Items]      
Equity securities, fair value 891    
Equity securities, cost 183    
Time Deposits Placed and Other Short-term Investments      
Debt Securities, Available-for-sale [Line Items]      
Time deposits placed and other short-term investments 1,000    
Nonperforming Financing Receivable      
Debt Securities, Available-for-sale [Line Items]      
Fair Value 9 $ 11  
Debt securities      
Debt Securities, Available-for-sale [Line Items]      
Accumulated net unrealized gain (loss) on AFS debt securities 1,800    
Accumulated other comprehensive income tax expense (benefit) $ 569