Income Taxes (Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Provision for federal income tax, at statutory rate	$ 148	$ 619	$ 563
State income tax provision, net of federal income tax effect	7	59	56
Foreign income tax rate differential	(15)	30	22
Noncontrolling interests	(7)	(8)	(11)
Change in valuation allowance	76	0	(29)
U.S. federal research and development credits	(54)	(27)	(1)
Goodwill impairment	26	0	0
Other, net	(17)	(30)	5
Provision for (benefit from) income taxes	$ 178	$ 649	$ 607