Funds Receivable and Customer Accounts (Tables)

12 Months Ended

Dec. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of assets underlying our funds receivable and customer accounts

The following table summarizes the assets underlying our funds receivable and customer accounts as of December 31, 2017 and December 31, 2016:

	As of December 31,
	2017		2016
	(In millions)
Cash and cash equivalents	$	5,192	$	4,319
Government and agency securities	6,651		5,625
Time deposits	739		522
Corporate debt securities	1,248		1,093
Funds receivable	4,412		2,804
Total funds receivable and customer accounts	$	18,242	$	14,363

Estimated fair value of our investments classified as available for sale included within funds receivable and customer accounts

As of December 31, 2017 and December 31, 2016, the estimated fair value of our investments classified as available-for-sale included within funds receivable and customer accounts was as follows:

	December 31, 2017
	Gross Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In millions)
Government and agency securities	$	5,946	$	—	$	(5	)	$	5,941
Corporate debt securities	529		—		—			529
Total	$	6,475	$	—	$	(5	)	$	6,470

	December 31, 2016
	Gross Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In millions)
Government and agency securities	$	5,198	$	—	$	(2	)	$	5,196
Corporate debt securities	531		—		—			531
Total	$	5,729	$	—	$	(2	)	$	5,727

The estimated fair values of our investments classified as available for sale included within funds receivable and customer accounts by date of contractual maturity

The estimated fair values of our investments classified as available-for-sale included within funds receivable and customer accounts by date of contractual maturity at December 31, 2017 were as follows:

	December 31, 2017
	(In millions)
One year or less	$	6,396
One year through two years	38
Two years through three years	36
Total	$	6,470

The estimated fair values of our short-term and long-term investments classified as available for sale by date of contractual maturity at December 31, 2017 were as follows:

	December 31, 2017
	(In millions)
One year or less	$	2,302
One year through two years	942
Two years through three years	672
Three years through four years	179
Four years through five years	58
Greater than five years	11
Total	$	4,164