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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Diluted earnings per share:
Net income available for common stockholders	$ 32	$ 32	$ 78	$ 81
Weighted Average Shares Outstanding [Abstract]
Weighted Average Number of Shares Outstanding, Basic	77,357,609	75,868,349	77,054,388	75,486,825
Potentially dilutive common shares:
Issuable pursuant to employee incentive plans	673,853	726,585	745,575	801,517
Weighted Average Number of Shares Outstanding, Diluted	78,031,462	76,594,934	77,799,963	76,288,342
Earnings Per Share, Diluted	$ 0.40	$ 0.43	$ 1.00	$ 1.07
Common Class A [Member]
Weighted Average Shares Outstanding [Abstract]
Weighted Average Number of Shares Outstanding, Basic	77,357,509	75,868,249	77,054,288	75,486,725
Common Class B [Member]
Weighted Average Shares Outstanding [Abstract]
Weighted Average Number of Shares Outstanding, Basic	100	100	100	100

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