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Equity And Earnings Per Share (Diluted Table) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Diluted earnings per share:
Net income available for common stockholders	$ 92	$ 32	$ 199	$ 78
Weighted Average Shares Outstanding [Abstract]
Weighted Average Number of Shares Outstanding, Basic	91,365,234	77,357,609	91,078,868	77,054,388
Potentially dilutive common shares:
Issuable pursuant to employee incentive plans	833,935	673,853	905,378	745,575
Weighted Average Number of Shares Outstanding, Diluted	92,199,169	78,031,462	91,984,246	77,799,963
Earnings Per Share, Diluted	$ 1.00	$ 0.40	$ 2.17	$ 1.00
Common Class A [Member]
Weighted Average Shares Outstanding [Abstract]
Weighted Average Number of Shares Outstanding, Basic	91,365,134	77,357,509	91,078,768	77,054,288
Common Class B [Member]
Weighted Average Shares Outstanding [Abstract]
Weighted Average Number of Shares Outstanding, Basic	100	100	100	100

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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