Deposits Deposits (Schedule of Maturities of Domestic Deposits of One Hundred Thousand or More) (Details) - Domestic Certificates of Deposit and Other Deposits [Member] - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Three Months or Less	$ 532	$ 822
Over three months to six months	385	456
Over six months to twelve months	659	733
Over twelve months	537	795
Total	$ 2,113	$ 2,806