Revenue Recognition (Allowance for Doubtful Accounts Rollforward) (Details) - Allowance for credit losses - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 112	$ 108	$ 103
Charged to Costs and Expenses	11	5	9
Charged to Revenue	49	31	25
Deductions and other	(38)	(32)	(29)
Ending balance	$ 134	$ 112	$ 108