Property And Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 123	$ 136	$ 176
Amortization expense on computer software and leasehold improvements	661	532	462
Computer software amortization	599	485	412
Capitalized costs related to the internal development of software	5,354	5,626
Impairment of property and equipment	$ 7	$ 73	$ 198