Deposits (Schedule of Interest Bearing Deposit Accounts) (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Deposits [Abstract]
Certificates of deposit in amounts less than $100,000		$ 21,071	$ 25,113
Certificates of deposit in amounts $100,000 or greater	[1]	9,771	9,268
Savings deposits, including money market deposit accounts		46,096	37,574
Total interest-bearing deposits		76,938	71,955
Certificates of deposit equal to or greater than $250,000		$ 2,800	$ 2,600

[1] Includes $2.8 billion and $2.6 billion in certificates of deposit equal to or greater than $250,000, the Federal Deposit Insurance Corporation ("FDIC") insurance limit, as of September 30, 2020 and December 31, 2019, respectively.