Leases (Lessee Right-of-Use Assets and Lease Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Right-of-use assets	$ 395	$ 466
Lease liabilities	$ 432	$ 511
Weighted average remaining lease term	6 years	6 years
Weighted average discount rate	2.25%	2.22%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities