Leases (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) branch	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) branch	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Leases [Abstract]
Number of branches | branch	422		422
Number of branches owned | branch	274		274
Number of branches leased | branch	148		148
Operating right-of-use assets, net of amortization	$ 217		$ 217		$ 218
Finance lease assets	4		4		4
Operating lease income	3	$ 3	9	$ 9
Sales-type or direct financing leases	319		319		$ 334
Sales-type or direct financing leases income	$ 3	$ 3	$ 10	$ 11