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, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 229,366 $ 302,631
Unrealized mark-to-market net gains (losses) (73) 243
Realized net gains (losses) 140 (49)
Other assets    
Debt Securities, Available-for-sale [Line Items]    
Equity securities, fair value 893  
Equity securities, cost 219  
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 $ 99
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Accumulated net unrealized loss on AFS debt securities 3,700  
Accumulated other comprehensive income tax expense (benefit) $ (1,200)