Loans (Nonperforming Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Total nonperforming loans	$ 1,644	$ 1,635
OREO and Foreclosed Assets	111	117
Total nonperforming assets	$ 1,755	$ 1,752
Nonperforming loans to total loans	0.62%	0.68%
Nonperforming assets to total loans, OREO and foreclosed assets	0.66%	0.73%
Nonperforming assets to total assets	0.39%	0.43%
Nonperforming loans, without allowance for credit losses	$ 300
Total commercial lending
Total nonperforming loans	566	$ 501
Total consumer lending
Total nonperforming loans	$ 1,078	$ 1,134