Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash paid for or (received from):
Interest expense	$ 70	$ 93
Interest and dividend income	(1)	(1)
Income taxes, net of refunds	37	6
Capital lease and other non-cash financing transactions	29	9
Cash received for franchise	7	4
Merry Maids [Member]
Cash paid for or (received from):
Total purchase price for conversion of certain company-owned Merry Maids branches to franchises	8	6
Cash received for franchise	6	4
Financing provided for franchise	$ 2	$ 2