Income Taxes (Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Provision for federal income tax, at statutory rate	$ 563	$ 70	$ 120
State income tax provision, net of federal income tax effect	56	2	10
Foreign income tax rate differential	22	2	(6)
CARES Act net operating loss carryback tax benefit	0	95	0
Noncontrolling interests	(11)	(9)	(8)
Change in valuation allowance	(29)	3	(17)
Other, net	6	(15)	9
Provision for (benefit from) income taxes	$ 607	$ (42)	$ 108