Investments (Tables)

9 Months Ended

Sep. 30, 2021

Investments [Abstract]

Marketable Securities

Our investments were as follows:

(in millions)	September 30, 2021		December 31, 2020
Short-term investments:
Equity investment security	$	27	$	27
Available-for-sale investment securities	295		—
Held-to-maturity investment securities	23		14
Time deposits	404		3
Total short-term investments	$	749	$	44

Long-term investments:
Equity and cost method investments	$	67	$	35
Restricted time deposits(1)	399		405
Total long-term investments	$	466	$	440

(1)See Note 8.

Unrealized Gain (Loss) on Investments

The amortized cost and fair value of held-to-maturity investment securities were as follows:

(in millions)	September 30, 2021				December 31, 2020
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Short-term investments, maturing within one year:
Corporate and other debt securities	$	3	$	3	$	14	$	14
Commercial paper	20		20		—		—
Total short-term held-to-maturity investments	$	23	$	23	$	14	$	14