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Available-for-Sale Debt Securities
 6 Months Ended
Jun. 30, 2019
Debt Securities, Available-for-sale [Abstract]  
Available-for-Sale Debt Securities
AVAILABLE-FOR-SALE DEBT SECURITIES
The following table summarizes our available-for-sale debt securities (in millions):
 
 
June 30, 2019
 
December 31, 2018
 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value 
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value 
U.S. treasury securities
 
$
3,917

 
$
1

 
$
(2
)
 
$
3,916

 
$
3,978

 
$
—

 
$
(9
)
 
$
3,969

Certificates of deposit
 
5,385

 
—

 
—

 
5,385

 
4,361

 
—

 
—

 
4,361

U.S. government agencies securities
 
1,531

 
—

 
—

 
1,531

 
943

 
—

 
(5
)
 
938

Non-U.S. government securities
 
420

 
—

 
—

 
420

 
307

 
—

 
(2
)
 
305

Corporate debt securities
 
13,272

 
3

 
(4
)
 
13,271

 
13,095

 
1

 
(29
)
 
13,067

Residential mortgage and asset-backed securities
 
537

 
—

 
(1
)
 
536

 
1,532

 
—

 
(8
)
 
1,524

Total
 
$
25,062

 
$
4

 
$
(7
)
 
$
25,059

 
$
24,216

 
$
1

 
$
(53
)
 
$
24,164


The following table summarizes the classification of our available-for-sale debt securities in our Condensed Consolidated Balance Sheets (in millions):
 
 
June 30, 2019
 
December 31, 2018
Cash and cash equivalents
 
$
6,065

 
$
10,592

Short-term marketable securities
 
15,943

 
12,149

Long-term marketable securities
 
3,051

 
1,423

Total
 
$
25,059

 
$
24,164


The following table summarizes our available-for-sale debt securities by contractual maturity (in millions):
 
 
June 30, 2019
 
 
Amortized Cost
 
Fair Value
Within one year
 
$
22,010

 
$
22,008

After one year through five years
 
3,016

 
3,015

After five years through ten years
 
19

 
19

After ten years
 
17

 
17

Total
 
$
25,062

 
$
25,059


The following table summarizes our available-for-sale debt securities that were in a continuous unrealized loss position, but were not deemed to be other-than-temporarily impaired (in millions):
 
 
Less Than 12 Months
 
12 Months or Greater
 
Total
 
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
June 30, 2019
 
 
 
 
 
 
 
 
 
 
 
 
U.S. treasury securities
 
$
(1
)
 
$
1,401

 
$
(1
)
 
$
470

 
$
(2
)
 
$
1,871

Certificates of deposit
 
—

 
8

 
—

 
—

 
—

 
8

U.S. government agencies securities
 
—

 
391

 
—

 
393

 
—

 
784

Non-U.S. government securities
 
—

 
11

 
—

 
161

 
—

 
172

Corporate debt securities
 
(1
)
 
922

 
(3
)
 
1,988

 
(4
)
 
2,910

Residential mortgage and asset-backed securities
 
—

 
26

 
(1
)
 
437

 
(1
)
 
463

Total
 
$
(2
)
 
$
2,759

 
$
(5
)
 
$
3,449

 
$
(7
)
 
$
6,208

 
 
 

 
 

 
 

 
 

 
 

 
 

December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
U.S. treasury securities
 
$
—

 
$
896

 
$
(9
)
 
$
1,383

 
$
(9
)
 
$
2,279

U.S. government agencies securities
 
—

 
30

 
(5
)
 
553

 
(5
)
 
583

Non-U.S. government securities
 
—

 
86

 
(2
)
 
192

 
(2
)
 
278

Corporate debt securities
 
(1
)
 
1,600

 
(28
)
 
4,204

 
(29
)
 
5,804

Residential mortgage and asset-backed securities
 
—

 
192

 
(8
)
 
1,186

 
(8
)
 
1,378

Total
 
$
(1
)
 
$
2,804

 
$
(52
)
 
$
7,518

 
$
(53
)
 
$
10,322


We held a total of 593 and 1,348 positions, which were in an unrealized loss position, as of June 30, 2019 and December 31, 2018, respectively.
Based on our review of these securities, we believe we had no other-than-temporary impairments as of June 30, 2019 and December 31, 2018, because we do not intend to sell these securities nor do we believe that we will be required to sell these securities before the recovery of their amortized cost basis. Gross realized gains and gross realized losses were not material for the three and six months ended June 30, 2019 and 2018.