Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 01, 2018	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2019
Details of assets and liabilities and operating results of discontinued operations
Number of shares of common stock shares received from spinoff company	1
Number of shares of Parent common stock exchanged for shares of Spinoff Company	2
Sublease Income			$ 1	$ 2
Frontdoor, inc. [Member]
Details of assets and liabilities and operating results of discontinued operations
Pro rata dividend to the Company's stockholders, percent of outstanding shares of common stock	80.20%
Percentage of outstanding common share exchanged		19.80%		19.80%
Transition Service Agreement, Fees Recorded During Period			1	$ 2
Rental income			1	2
Sublease Income			1	$ 6
Written notice period for termination of service agreement				90 days
Payments received from spin-off entity				$ 1
Proceeds from related party				$ 4
Maximum [Member] | Frontdoor, inc. [Member]
Details of assets and liabilities and operating results of discontinued operations
Payments received from spin-off entity			1
Proceeds from related party			$ 1