Deposit Liabilities (Schedule of Deposit Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deposits [Abstract]
Noninterest-bearing deposits	$ 119	$ 142
Interest-bearing Deposit Liabilities, by Component [Abstract]
Interest-bearing deposits, savings and money-market checking accounts	62,486	56,050
Interest-bearing deposits, certificates of deposits	58,146	49,985
Interest-bearing deposits, other	1	1
Total deposit liabilities	120,752	106,178
Certificates of deposit, $100,000 or more	25,600	21,000
Certificates of deposit, in excess of $250,000 federal insurance limit	$ 8,200	$ 6,100