Short-Term and Long-Term Investments (Tables)

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities

As of December 31, 2017, our short-term investments consist of available-for-sale securities as follows (in millions):



	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Mutual funds	$	16	$	—	$	—	$	16

As of December 31, 2016, our short-term and long-term investments consist of available-for-sale securities as follows (in millions):



	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Cetip equity securities	$	324	$	108	$	—	$	432
Mutual funds	23		—		—		23
Total available-for-sale securities	$	347	$	108	$	—	$	455

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details