Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash paid for or (received from):
Interest expense	$ 112	$ 149
Interest and dividend income	(2)	(2)
Income taxes, net of refunds	58	38
Capital lease and other non-cash financing transactions	50	22
Cash received for franchise	7	9
Merry Maids [Member]
Cash paid for or (received from):
Total purchase price for conversion of certain company-owned Merry Maids branches to franchises	9	12
Cash received for franchise	6	9
Financing provided for franchise	$ 2	$ 3