Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income before income taxes	$ 987	$ 1,251	$ 309
Net loss attributable to noncontrolling interests	0	3	0
Income attributable to common stockholders before income taxes	$ 987	$ 1,254	$ 309
Federal statutory income tax rate	21.00%	21.00%	35.00%
Provision for federal income taxes at the statutory rate	$ (207)	$ (263)	$ (108)
State income tax provision (net of federal tax)	(12)	(12)	(4)
Change in federal income tax rate	0	0	625
Other	(12)	(1)	11
Income tax (provision) benefit	$ (231)	$ (276)	$ 524
Effective income tax rate, excluding net loss attributable to noncontrolling interests	23.00%	22.00%	(170.00%)
Income tax benefit from rate change			$ 625

Effective Income Tax Rate Reconciliation, Effect of Tax Cuts and Jobs Act of 2017, Amount

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Income loss from continuing operations before tax

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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