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Available-for-Sale Debt Securities
 3 Months Ended
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Available-for-Sale Debt Securities
AVAILABLE-FOR-SALE DEBT SECURITIES
The following table summarizes our available-for-sale debt securities (in millions):
 
 
March 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 
Corporate debt securities
 
$
12,044

 
$
2

 
$
(74
)
 
$
11,972

 
$
14,790

 
$
3

 
$
(46
)
 
$
14,747

U.S. treasury securities
 
3,912

 
—

 
(28
)
 
3,884

 
4,090

 
—

 
(29
)
 
4,061

Residential mortgage and asset-backed securities
 
3,427

 
—

 
(21
)
 
3,406

 
4,072

 
1

 
(15
)
 
4,058

U.S. government agencies securities
 
934

 
—

 
(9
)
 
925

 
934

 
—

 
(8
)
 
926

Certificates of deposit
 
3,908

 
—

 
—

 
3,908

 
5,131

 
—

 
—

 
5,131

Non-U.S. government securities
 
563

 
—

 
(4
)
 
559

 
668

 
—

 
(4
)
 
664

Total
 
$
24,788

 
$
2

 
$
(136
)
 
$
24,654

 
$
29,685

 
$
4

 
$
(102
)
 
$
29,587


The following table summarizes the classification of our available-for-sale debt securities on our Condensed Consolidated Balance Sheets (in millions):
 
 
March 31, 2018
 
December 31, 2017
Cash and cash equivalents
 
$
195

 
$
481

Short-term marketable securities
 
16,355

 
17,922

Long-term marketable securities
 
8,104

 
11,184

Total
 
$
24,654

 
$
29,587


The following table summarizes our available-for-sale debt securities by contractual maturity (in millions):
 
 
March 31, 2018
 
 
Amortized Cost
 
Fair Value
Within one year
 
$
16,591

 
$
16,550

After one year through five years
 
8,094

 
8,003

After five years through ten years
 
76

 
74

After ten years
 
27

 
27

Total
 
$
24,788

 
$
24,654


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
March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
(25
)
 
$
6,256

 
$
(48
)
 
$
3,604

 
$
(73
)
 
$
9,860

U.S. treasury securities
 
(2
)
 
547

 
(27
)
 
3,337

 
(29
)
 
3,884

Residential mortgage and asset-backed securities
 
(7
)
 
1,682

 
(15
)
 
1,289

 
(22
)
 
2,971

U.S. government agencies securities
 
(1
)
 
182

 
(8
)
 
723

 
(9
)
 
905

Non-U.S. government securities
 
—

 
145

 
(3
)
 
413

 
(3
)
 
558

Total
 
$
(35
)
 
$
8,812

 
$
(101
)
 
$
9,366

 
$
(136
)
 
$
18,178

 
 
 

 
 

 
 

 
 

 
 

 
 

December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities
 
$
(14
)
 
$
7,674

 
$
(32
)
 
$
3,561

 
$
(46
)
 
$
11,235

U.S. treasury securities
 
(2
)
 
821

 
(27
)
 
3,240

 
(29
)
 
4,061

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

 
(11
)
 
1,206

 
(15
)
 
3,451

U.S. government agencies securities
 
(1
)
 
206

 
(7
)
 
700

 
(8
)
 
906

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

 
(3
)
 
461

 
(4
)
 
664

Total
 
$
(22
)
 
$
11,149

 
$
(80
)
 
$
9,168

 
$
(102
)
 
$
20,317


We held a total of 2,588 and 2,957 positions as of March 31, 2018 and December 31, 2017, respectively, that were in an unrealized loss position.
Based on our review of these securities, we believe we had no other-than-temporary impairments as of March 31, 2018 and December 31, 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 three months ended March 31, 2018 and 2017.