Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Revenue by type

Revenue for the years ended December 31, 2015, 2014, and 2013 consists of the following (in millions):

	Year Ended December 31,
	2015		2014		2013
Advertising	$	17,079	$	11,492	$	6,986
Payments and other fees	849		974		886
Total revenue	$	17,928	$	12,466	$	7,872

Estimated useful lives of property and equipment

The estimated useful lives of property and equipment are described below:

Property and Equipment	Useful Life
Network equipment	Three to five years
Buildings	Three to 30 years
Computer software, office equipment and other	Three to five years
Leased equipment and leasehold improvements	Lesser of estimated useful life or remaining lease term

Deferred revenue and deposits

Deferred revenue and deposits consists of the following (in millions):

	December 31,
	2015		2014
Deferred revenue	$	28	$	38
Deposits	28		28
Total deferred revenue and deposits	$	56	$	66