Income Taxes (Reconciliation Of Effective Income Tax Rate) (Details)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of income tax computed at the U.S. federal statutory tax rate to the entity's effective income tax rate for continuing operations
Tax at U.S. federal statutory rate (as a percent)		21.00%	21.00%	35.00%
State and local income taxes, net of U.S. federal benefit (as a percent)		3.30%	(7.10%)	5.70%
Tax credits (as a percent)		(1.50%)	1.50%	(1.30%)
Investment in frontdoor, inc. mark-to-market adjustment (as a percent)		(5.50%)	(41.50%)
Other permanent items (as a percent)		1.00%	(2.10%)	1.80%
U.S. Tax Reform rate change (as a percent)	[1]		(2.70%)	(273.60%)
Remeasurment of prior year tax positions (as a percent)			(0.90%)
Excess tax benefits from stock-based compensation (as a percent)		(0.80%)	1.10%	(14.50%)
Other, including foreign rate differences and reserves (as a percent)		(0.50%)	1.70%	1.40%
Effective rate (as a percent)		17.10%	(29.10%)	(245.60%)

[1] Deferred income taxes in the Consolidated Statements of Financial Position at December 31, 2018 and 2017, were remeasured as a result of U.S. Tax Reform.