Leases (Operating Lease Assets and Liabilities ) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Right-of-use assets	$ 1,919	$ 1,876
Operating lease, right-of-use asset, statement of financial position [Extensible Enumeration]	Other	Other
Lease liabilities	$ 2,220	$ 2,097
Operating lease, liability, statement of financial position [Extensible Enumeration]	Accrued expenses and other liabilities	Accrued expenses and other liabilities