Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents [Table Text Block]

The following table reconciles cash, cash equivalents and restricted cash reported in our consolidated balance sheets to the total amount presented in our consolidated statements of cash flows:

	December 31, 2018		December 31, 2017
	(in millions)
Cash and cash equivalents	$	2,443	$	2,847
Restricted cash and cash equivalents	259		69
Restricted cash included within long-term investments and other assets	3		1
Total cash, cash equivalents and restricted cash and cash equivalents in the consolidated statement of cash flow	$	2,705	$	2,917

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

The cumulative effect of the revenue accounting changes made to our consolidated balance sheet as of January 1, 2018 were as follows:

	Balance at December 31, 2017		Adjustments			Balance at January 1, 2018
	(in millions)
Current and long-term assets:
Accounts receivable, net	$	1,866	$	(40	)	$	1,826
Prepaid expenses and other current assets	269		(1		)	268
Long-term investments and other assets	845		(3		)	842
Current and long-term liabilities:
Deferred merchant bookings	3,219		619			3,838
Accrued expenses and other current liabilities	1,265		(564		)	701
Deferred income taxes	329		(3		)	326
Stockholders' equity:
Retained earnings	331		(8		)	323