Deposits (Schedule of Interest Bearing Deposit Accounts) (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Certificates of deposit in amounts less than $100,000		$ 23,681	$ 25,113
Certificates of deposit in amounts $100,000 or greater	[1]	10,181	9,268
Savings deposits, including money market deposit accounts		38,730	37,574
Total interest-bearing deposits		72,592	71,955
Certificates of deposit equal to or greater than $250,000		$ 2,900	$ 2,600

[1] Includes $2.9 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 March 31, 2020 and December 31, 2019, respectively.