Goodwill and Other Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Estimated Future Amortization Expense
2017	$ 27
2018	26
2019	25
2020	22
2021	22
Thereafter	191
Net Carrying Amount	313	$ 246
Core deposit intangibles
Schedule Of Estimated Future Amortization Expense
2017	7
2018	6
2019	5
2020	4
2021	4
Thereafter	9
Net Carrying Amount	35	49
Trade names
Schedule Of Estimated Future Amortization Expense
2017	3
2018	3
2019	3
2020	3
2021	3
Thereafter	69
Net Carrying Amount	84	87
Customer Relationships
Schedule Of Estimated Future Amortization Expense
2017	16
2018	16
2019	16
2020	15
2021	15
Thereafter	113
Net Carrying Amount	191	84
Other
Schedule Of Estimated Future Amortization Expense
2017	1
2018	1
2019	1
2020	0
2021	0
Thereafter	0
Net Carrying Amount	$ 3	$ 26