Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Fair value, assets measured on a recurring and/or non-recurring basis

The table below segregates all of our financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date (amounts in millions):

			Fair Value Measurements at December 31, 2020 Using
	As of December 31, 2020		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance Sheet Classification
Financial Assets:
Recurring fair value measurements:
Money market funds	$	8,345	$	8,345	$	—	$	—	Cash and cash equivalents
Foreign government treasury bills	34		34		—		—		Cash and cash equivalents
U.S. treasuries and government agency securities	164		164		—		—		Other current assets
Total recurring fair value measurements	$	8,543	$	8,543	$	—	$	—
Financial Liabilities:
Foreign currency forward contracts not designated as hedges	$	(2)	$	—	$	(2)	$	—	Accrued expenses and other liabilities
Foreign currency forward contracts designated as hedges	$	(24)	$	—	$	(24)	$	—	Accrued expenses and other liabilities

			Fair Value Measurements at December 31, 2019 Using
	As of December 31, 2019		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance Sheet Classification
Financial Assets:
Recurring fair value measurements:
Money market funds	$	5,320	$	5,320	$	—	$	—	Cash and cash equivalents
Foreign government treasury bills	37		37		—		—		Cash and cash equivalents
U.S. treasuries and government agency securities	65		65		—		—		Other current assets
Total recurring fair value measurements	$	5,422	$	5,422	$	—	$	—
Financial Liabilities:
Foreign currency forward contracts not designated as hedges	$	(2)	$	—	$	(2)	$	—	Accrued expenses and other liabilities
Foreign currency forward contracts designated as hedges	$	(2)	$	—	$	(2)	$	—	Accrued expenses and other liabilities

Foreign currency forward contracts

The total gross notional amounts and fair values of our Cash Flow Hedges, all of which have remaining maturities of 11 months or less, are as follows (amounts in millions):

	As of December 31, 2020				As of December 31, 2019
	Notional amount		Fair value gain (loss)		Notional amount		Fair value gain (loss)
Foreign Currency:
Buy USD, Sell Euro	$	542	$	(24)	$	350	$	(2)

The total gross notional amounts and fair values of our foreign currency forward contracts not designated as hedges are as follows (amounts in millions):

	As of December 31, 2020				As of December 31, 2019
	Notional amount		Fair value gain (loss)		Notional amount		Fair value gain (loss)
Foreign Currency:
Buy USD, Sell GBP	$	116	$	(2)	$	25	$	(2)

Net realized gains (losses) reclassified out of accumulated other comprehensive income (loss)

The amounts of pre-tax net realized gains (losses) associated with our Cash Flow Hedges that were reclassified out of “Accumulated other comprehensive income (loss)” and into earnings are as follows (amounts in millions):

	For the Years Ended December 31,
	2020		2019		2018		Statement of Operations Classification
Cash Flow Hedges	$	(3)	$	39	$	7	Net revenues