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Available-for-Sale Debt Securities
 12 Months Ended
Dec. 31, 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):
 
 
December 31, 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
 
$
2,433

 
$
—

 
$
—

 
$
2,433

 
$
3,978

 
$
—

 
$
(9
)
 
$
3,969

Certificates of deposit
 
3,517

 
—

 
—

 
3,517

 
4,361

 
—

 
—

 
4,361

U.S. government agencies securities
 
1,081

 
—

 
—

 
1,081

 
943

 
—

 
(5
)
 
938

Non-U.S. government securities
 
174

 
—

 
—

 
174

 
307

 
—

 
(2
)
 
305

Corporate debt securities
 
9,203

 
2

 
(1
)
 
9,204

 
13,095

 
1

 
(29
)
 
13,067

Residential mortgage and asset-backed securities
 
91

 
—

 
—

 
91

 
1,532

 
—

 
(8
)
 
1,524

Total
 
$
16,499

 
$
2

 
$
(1
)
 
$
16,500

 
$
24,216

 
$
1

 
$
(53
)
 
$
24,164


The following table summarizes the classification of our available-for-sale debt securities in our Consolidated Balance Sheets (in millions):
 
December 31, 2019
 
December 31, 2018
Cash and cash equivalents
$
2,291

 
$
10,592

Short-term marketable securities
12,721

 
12,149

Long-term marketable securities
1,488

 
1,423

Total
$
16,500

 
$
24,164


The following table summarizes our available-for-sale debt securities by contractual maturity (in millions):
 
December 31, 2019
 
Amortized Cost
 
Fair Value
Within one year
$
15,011

 
$
15,012

After one year through five years
1,465

 
1,465

After five years
23

 
23

Total
$
16,499

 
$
16,500


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, 2019
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
(1
)
 
$
1,866

 
$
—

 
$
4

 
$
(1
)
 
$
1,870

 
 


 


 


 


 


 


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 305 and 1,348 positions, which were in an unrealized loss position as of December 31, 2019 and 2018, respectively.
Based on our review of these securities, we believe we had no other-than-temporary impairments as of December 31, 2019 and 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 on available-for-sale debt securities were not material for the years ended December 31, 2019 and 2018.