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INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Investments
The following table summarizes, by major security type, the Company's investments in marketable securities at March 31, 2019 (in millions): 
 
 
Cost
 
Gross
Unrealized Gains
 
Gross
Unrealized Losses
 
Fair
 Value
Short-term investments in marketable securities:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
218

 
$
—

 
$
—

 
$
218

U.S. government securities
 
242

 
—

 
(1
)
 
241

Corporate debt securities
 
1,519

 
1

 
(6
)
 
1,514

U.S. government agency securities
 
1

 
—

 
—

 
1

Commercial paper
 
4

 
—

 
—

 
4

Time deposits and certificates of deposit
 
3

 
—

 
—

 
3

Total
 
$
1,987

 
$
1

 
$
(7
)
 
$
1,981

 
 
 
 
 
 
 
 
 
Long-term investments in marketable securities:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
879

 
$
5

 
$
—

 
$
884

U.S. government securities
 
250

 
—

 
(4
)
 
246

Corporate debt securities
 
3,794

 
12

 
(23
)
 
3,783

Ctrip convertible debt securities
 
1,275

 
69

 
—

 
1,344

Marketable equity securities
 
1,105

 
383

 
(1
)
 
1,487

Total
 
$
7,303

 
$
469

 
$
(28
)
 
$
7,744

The following table summarizes, by major security type, the Company's investments in marketable securities at December 31, 2018 (in millions):
 
 
Cost
 
Gross 
Unrealized 
Gains
 
Gross 
Unrealized
 Losses
 
Fair
 Value
Short-term investments in marketable securities:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
314

 
$
—

 
$
—

 
$
314

U.S. government securities
 
658

 
—

 
(2
)
 
656

Corporate debt securities
 
2,693

 
—

 
(12
)
 
2,681

U.S. government agency securities
 
1

 
—

 
—

 
1

Commercial paper
 
7

 
—

 
—

 
7

Time deposits and certificates of deposit
 
1

 
—

 
—

 
1

Total
 
$
3,674

 
$
—

 
$
(14
)
 
$
3,660

 
 
 
 
 
 
 
 
 
Long-term investments in marketable securities:
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
International government securities
 
$
797

 
$
3

 
$
—

 
$
800

U.S. government securities
 
299

 
—

 
(6
)
 
293

Corporate debt securities
 
4,445

 
4

 
(48
)
 
4,401

Ctrip Convertible debt securities
 
1,275

 
—

 
(98
)
 
1,177

Marketable equity securities
 
1,105

 
3

 
(72
)
 
1,036

Total
 
$
7,921

 
$
10

 
$
(224
)
 
$
7,707