Deposit Liabilities (Schedule of Maturities For Total Time Deposits) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Maturities For Total Time Deposits [Line Items]
Time Deposits	$ 31,070	$ 31,640
One year or less [Member]
Schedule of Maturities For Total Time Deposits [Line Items]
Time Deposits	17,143
Two years or less [Member]
Schedule of Maturities For Total Time Deposits [Line Items]
Time Deposits	9,150
Three years or less [Member]
Schedule of Maturities For Total Time Deposits [Line Items]
Time Deposits	3,199
Four years or less [Member]
Schedule of Maturities For Total Time Deposits [Line Items]
Time Deposits	1,235
Five years or less [Member]
Schedule of Maturities For Total Time Deposits [Line Items]
Time Deposits	$ 343