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Available-for-Sale Debt Securities
 12 Months Ended
Dec. 31, 2018
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):
 
 
December 31, 2018
 
December 31, 2017
 
 
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
 
$
3,978

 
$
—

 
$
(9
)
 
$
3,969

 
$
4,090

 
$
—

 
$
(29
)
 
$
4,061

Certificates of deposit
 
4,361

 
—

 
—

 
4,361

 
5,131

 
—

 
—

 
5,131

U.S. government agencies securities
 
943

 
—

 
(5
)
 
938

 
934

 
—

 
(8
)
 
926

Non-U.S. government securities
 
307

 
—

 
(2
)
 
305

 
668

 
—

 
(4
)
 
664

Corporate debt securities
 
13,095

 
1

 
(29
)
 
13,067

 
14,790

 
3

 
(46
)
 
14,747

Residential mortgage and asset-backed securities
 
1,532

 
—

 
(8
)
 
1,524

 
4,072

 
1

 
(15
)
 
4,058

Total
 
$
24,216

 
$
1

 
$
(53
)
 
$
24,164

 
$
29,685

 
$
4

 
$
(102
)
 
$
29,587


The following table summarizes the classification of our available-for-sale debt securities in our Consolidated Balance Sheets (in millions):
 
December 31, 2018
 
December 31, 2017
Cash and cash equivalents
$
10,592

 
$
481

Short-term marketable securities
12,149

 
17,922

Long-term marketable securities
1,423

 
11,184

Total
$
24,164

 
$
29,587


The following table summarizes our available-for-sale debt securities by contractual maturity (in millions):
 
December 31, 2018
 
Amortized Cost
 
Fair Value
Within one year
$
22,786

 
$
22,741

After one year through five years
1,364

 
1,358

After five years through ten years
46

 
45

After ten years
20

 
20

Total
$
24,216

 
$
24,164


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
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

 
 


 


 


 


 


 


December 31, 2017
 


 


 


 


 


 


U.S. treasury securities
 
$
(2
)
 
$
821

 
$
(27
)
 
$
3,240

 
$
(29
)
 
$
4,061

U.S. government agencies securities
 
(1
)
 
206

 
(7
)
 
700

 
(8
)
 
906

Non-U.S. government securities
 
(1
)
 
203

 
(3
)
 
461

 
(4
)
 
664

Corporate debt securities
 
(14
)
 
7,674

 
(32
)
 
3,561

 
(46
)
 
11,235

Residential mortgage and asset-backed securities
 
(4
)
 
2,245

 
(11
)
 
1,206

 
(15
)
 
3,451

Total
 
$
(22
)
 
$
11,149

 
$
(80
)
 
$
9,168

 
$
(102
)
 
$
20,317


We held a total of 1,348 and 2,957 positions, which were in an unrealized loss position as of December 31, 2018 and 2017, respectively.
Based on our review of these securities, we believe we had no other-than-temporary impairments as of December 31, 2018 and 2017, 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 years presented.