Fair Value Measurement of Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of fair value of assets and liabilities measured on a recurring basis

The following tables present our financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017 (in millions):



	June 30, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	$	1,619	$	1,619	$	—	$	—
Short-term investments:
Restricted cash	17		17		—		—
Corporate debt securities	2,371		—		2,371		—
Total short-term investments	2,388		17		2,371		—
Derivatives	300		—		150		150
Long-term investments:
Corporate debt securities	4,550		—		4,550		—
Total long-term investments	4,550		—		4,550		—
Total financial assets	$	8,857	$	1,636	$	7,071	$	150

Liabilities:
Derivatives	$	82	$	—	$	82	$	—



	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	$	2,120	$	2,120	$	—
Short-term investments:
Restricted cash	20		20		—
Corporate debt securities	3,723		—		3,723
Total short-term investments	3,743		20		3,723
Derivatives	28		—		28
Long-term investments:
Corporate debt securities	5,446		—		5,446
Total long-term investments	5,446		—		5,446
Total financial assets	$	11,337	$	2,140	$	9,197

Liabilities:
Derivatives	$	29	$	—	$	29

Schedule of Assets Measured Using Significant Unobservable Inputs

The following table presents a reconciliation of the opening to closing balance of assets measured using significant unobservable inputs (Level 3) as of June 30, 2018 (in millions):



	June 30, 2018
Opening balance as of January 1, 2018	$	—
Recognition of warrant	44
Change in fair value	106
Closing balance as of June 30, 2018	$	150