Goodwill Mortgage Servicing Rights (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment charge			$ 0	$ 0
Mortgage servicing rights	$ 1,793,000,000		1,793,000,000		$ 1,242,000,000
Fees from mortgage and other loan servicing	$ 100,000,000	$ 100,000,000	$ 200,000,000	$ 200,000,000