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Short-Term Borrowings-Quarterly Schedule (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Short-term Debt [Line Items]                              
Quarter end balance $ 4,952       $ 3,659       $ 4,180       $ 4,952 $ 3,659 $ 4,180
Securities sold under repurchase agreements [Member]                              
Short-term Debt [Line Items]                              
Quarter end balance 1,765 [1] $ 2,185 $ 2,218 $ 12,497 1,072 [1] $ 5,568 $ 3,553 $ 3,714 1,466 [1] $ 2,471 $ 2,743 $ 2,792 1,765 [1] 1,072 [1] 1,466 [1]
Average quarterly balance $ 2,140 $ 2,534 $ 7,210 $ 7,240 $ 1,483 $ 8,432 $ 3,433 $ 3,142 $ 3,045 $ 3,550 $ 5,008 $ 5,182 $ 4,768 4,130 $ 4,189
Loss on extinguishment of certain repurchase agreements                           $ (14)  
[1] The following table presents the quarter end and average quarterly balances of securities sold under repurchase agreements: