Leases (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) branch	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) branch	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Leases [Abstract]
Number of branches | branch	419		419
Number of branches owned | branch	273		273
Number of branches leased | branch	146		146
Operating right-of-use assets, net of amortization	$ 196		$ 196		$ 213
Finance lease assets	4		4		4
Operating lease income	3	$ 3	10	$ 9
Sales-type or direct financing leases	293		293		$ 320
Sales-type or direct financing leases income	$ 3	$ 3	$ 9	$ 10