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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Fair Value by Major Security Type
The following table summarizes, by major security type, our cash, cash equivalents, restricted cash, and marketable securities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in millions):
 
December 31, 2018
 
June 30, 2019
  
Total
Estimated
Fair Value
 
Cost or
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Total
Estimated
Fair Value
Cash
$
10,406

 
$
8,553

 
$

 
$

 
$
8,553

Level 1 securities:
 
 
 
 
 
 
 
 
 
Money market funds
12,515

 
10,757

 

 

 
10,757

Equity securities (1)
170

 
 
 
 
 
 
 
277

Level 2 securities:
 
 
 
 
 
 
 
 
 
Foreign government and agency securities
815

 
1,596

 

 

 
1,596

U.S. government and agency securities
11,667

 
8,573

 
13

 
(5
)
 
8,581

Corporate debt securities
4,990

 
9,915

 
31

 
(2
)
 
9,944

Asset-backed securities
892

 
1,834

 
7

 
(1
)
 
1,840

Other fixed income securities
188

 
264

 
2

 

 
266

Equity securities (1)
33

 
 
 
 
 
 
 

 
$
41,676

 
$
41,492

 
$
53

 
$
(8
)
 
$
41,814

Less: Restricted cash, cash equivalents, and marketable securities (2)
(426
)
 
 
 
 
 
 
 
(351
)
Total cash, cash equivalents, and marketable securities
$
41,250

 
 
 
 
 
 
 
$
41,463

___________________
(1)
The related unrealized gain (loss) recorded in “Other income (expense), net” was $14 million in Q2 2019 and $82 million for the six months ended June 30, 2019.
(2)
We are required to pledge or otherwise restrict a portion of our cash, cash equivalents, and marketable securities as collateral for real estate leases, amounts due to third-party sellers in certain jurisdictions, debt, and standby and trade letters of credit. We classify cash, cash equivalents, and marketable securities with use restrictions of less than twelve months as “Accounts receivable, net and other” and of twelve months or longer as non-current “Other assets” on our consolidated balance sheets. See “Note 4 — Commitments and Contingencies.”
Investments Classified by Contractual Maturity Date
The following table summarizes the remaining contractual maturities of our cash equivalents and marketable fixed income securities as of June 30, 2019 (in millions):
 
Amortized
Cost
 
Estimated
Fair Value
Due within one year
$
24,249

 
$
24,255

Due after one year through five years
7,428

 
7,467

Due after five years through ten years
296

 
296

Due after ten years
966

 
966

Total
$
32,939

 
$
32,984


Actual maturities may differ from the contractual maturities because borrowers may have certain prepayment conditions.
Reconciliation of cash, cash equivalents, and restricted cash
The following table provides a reconciliation of the amount of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets to the total of the same such amounts shown in the consolidated statements of cash flows (in millions):
 
December 31, 2018
 
June 30, 2019
Cash and cash equivalents
$
31,750

 
$
22,616

Restricted cash included in accounts receivable, net and other
418

 
318

Restricted cash included in other assets
5

 
31

Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows
$
32,173

 
$
22,965