Leases (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Finance lease right-of-use assets	$ 93
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Equipment, office facilities, and property — net	Equipment, office facilities, and property — net
Finance lease liabilities	$ 94	$ 6
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt