Valuation And Qualifying Accounts (Allowance For Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for Credit Loss
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 1,163	$ 1,457	$ 1,150
Charged to Costs and Expenses	1,865	1,241	1,798
Charged to Other Accounts	0	0	405
Acquisitions	0	0	0
Deductions	2,017	1,535	1,896
Balance at End of Period	1,011	1,163	1,457
Allowance for Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	4,343	4,557	4,715
Charged to Costs and Expenses	(168)	(214)	(158)
Charged to Other Accounts	0	0	0
Acquisitions	0	0	0
Deductions	0	0	0
Balance at End of Period	$ 4,175	$ 4,343	$ 4,557