Income Taxes (Net Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Components of Deferred Tax Assets and Liabilities [Abstract]
Deferred tax assets	$ 11,258	$ 11,600
Deferred tax liabilities	(8,976)	(9,430)
Valuation allowance	(2,423)	(3,094)
Deferred Tax Liabilities, Net	$ 141	$ 924