Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investment [Line Items]
Gain on sale of business	$ 2	$ 0	$ 51	$ 0
Income from cash and cash investments and short-term bank deposits	1	1	3	3
Equity investment income, net	0	0	1	1
Foreign currency transaction gains (losses)	3	(3)	3	(1)
Other items, net	0	2	0	(1)
Total other, net	4	1	58	5
Auction Rate Securities
Investment [Line Items]
Realized gains from investments	0	0	0	1
Private equity funds
Investment [Line Items]
Realized gains from investments	0	1	2	2
Impairment of private equity funds	$ (2)	$ 0	$ (2)	$ 0