Income Taxes (Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Provision for federal income tax, at statutory rate	$ 619	$ 563	$ 70
State income tax provision, net of federal income tax effect	59	56	2
Foreign income tax rate differential	30	22	2
CARES Act net operating loss carryback tax benefit	0	0	(95)
Noncontrolling interests	(8)	(11)	(9)
Change in valuation allowance	0	(29)	3
U.S. federal research and development credits	(27)	(1)	(2)
Other, net	(24)	7	(13)
Provision for (benefit from) income taxes	$ 649	$ 607	$ (42)