Retirement Benefits (Net Amount Included In Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	$ 363	$ 415
Current liabilities	(6)	(6)
Noncurrent liabilities	(38)	(52)
Net amount at December 31	319	357
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	22	28
Current liabilities	0	0
Noncurrent liabilities	0	0
Net amount at December 31	$ 22	$ 28