Retirement Benefits (Components Of Net Periodic Benefit Cost (Benefit Credit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 28	$ 26	$ 29
Settlement Loss, Statement of Income or Comprehensive Income Location	Selling, general and administrative expense	Selling, general and administrative expense	Selling, general and administrative expense
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	52	34	$ 47
Expected return on assets	(101)	(134)	(138)
Recognized actuarial loss	16	25	24
Settlement loss	28	26	29
Net periodic benefit credit	(5)	(49)	(38)
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	1
Interest cost	7	5	10
Expected return on assets	(26)	(26)	(25)
Amortization of prior service credit	(4)	(4)	(7)
Net periodic benefit credit	$ (23)	$ (24)	$ (21)