Leases - Components of Lease Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Interest income on lease financing	[1]	$ 13	$ 13	$ 41	$ 39

[1] Included in Interest Income – Loans and leases in the Consolidated Statements of Income and Comprehensive Income.