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Available-for-Sale Debt Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Debt Securities, Available-for-sale [Abstract]  
Reconciliation of Available-for-Sale Debt Securities from Cost Basis to Fair Value
The following table summarizes our available-for-sale debt securities (in millions):
 
 
March 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
 
$
4,786

 
$
—

 
$
(4
)
 
$
4,782

 
$
3,978

 
$
—

 
$
(9
)
 
$
3,969

Certificates of deposit
 
4,211

 
—

 
—

 
4,211

 
4,361

 
—

 
—

 
4,361

U.S. government agencies securities
 
1,446

 
—

 
(2
)
 
1,444

 
943

 
—

 
(5
)
 
938

Municipal debt securities
 
25

 
—

 
—

 
25

 
—

 
—

 
—

 
—

Non-U.S. government securities
 
453

 
—

 
(1
)
 
452

 
307

 
—

 
(2
)
 
305

Corporate debt securities
 
12,576

 
1

 
(12
)
 
12,565

 
13,095

 
1

 
(29
)
 
13,067

Residential mortgage and asset-backed securities
 
1,040

 
—

 
(4
)
 
1,036

 
1,532

 
—

 
(8
)
 
1,524

Total
 
$
24,537

 
$
1

 
$
(23
)
 
$
24,515

 
$
24,216

 
$
1

 
$
(53
)
 
$
24,164
Summary of Classification of Available-for-Sale Debt Securities
The following table summarizes the classification of our available-for-sale debt securities in our Condensed Consolidated Balance Sheets (in millions):
 
 
March 31, 2019
 
December 31, 2018
Cash and cash equivalents
 
$
11,317

 
$
10,592

Short-term marketable securities
 
10,977

 
12,149

Long-term marketable securities
 
2,221

 
1,423

Total
 
$
24,515

 
$
24,164
Summary of Available-for-Sale Debt Securities by Contractual Maturity
The following table summarizes our available-for-sale debt securities by contractual maturity (in millions):
 
 
March 31, 2019
 
 
Amortized Cost
 
Fair Value
Within one year
 
$
22,313

 
$
22,294

After one year through five years
 
2,175

 
2,172

After five years through ten years
 
31

 
31

After ten years
 
18

 
18

Total
 
$
24,537

 
$
24,515
Summary of Available-for-Sale Debt Securities in a Continuous Loss Position Deemed not to be Other-than-Temporarily Impaired
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, 2019
 
 
 
 
 
 
 
 
 
 
 
 
U.S. treasury securities
 
$
—

 
$
2,971

 
$
(4
)
 
$
917

 
$
(4
)
 
$
3,888

U.S. government agencies securities
 
—

 
483

 
(2
)
 
458

 
(2
)
 
941

Non-U.S. government securities
 
—

 
100

 
(1
)
 
160

 
(1
)
 
260

Corporate debt securities
 
(1
)
 
1,049

 
(11
)
 
2,938

 
(12
)
 
3,987

Residential mortgage and asset-backed securities
 
—

 
85

 
(4
)
 
817

 
(4
)
 
902

Total
 
$
(1
)
 
$
4,688

 
$
(22
)
 
$
5,290

 
$
(23
)
 
$
9,978

 
 
 

 
 

 
 

 
 

 
 

 
 

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