Revenue Recognition Other Service changes, commissions and fees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Service charges, commissions and fees [Line Items]
Other Service Charges, Commissions and Fees	$ 228	$ 217	$ 208
Revenue Recognition [Member]
Other Service charges, commissions and fees [Line Items]
Interest and Fee Income, Loans, Consumer Installment, Credit Card	138
ATM Fees	10
Other Service Charges	14
Other Commissions and Fees	21
Other Service Charges, Commissions and Fees	$ 183