Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

Income before provision for income taxes consists of the following (in millions):

	Year Ended December 31,
	2017		2016		2015
Domestic	$	8,099	$	7,646	$	7,953
Foreign	5,430		9,451		13,706
Total income before provision for income taxes	$	13,529	$	17,097	$	21,659

Schedule Of Provision For Income Taxes

The provision for income taxes consists of the following (in millions):

	Year Ended December 31,
	2017			2016			2015
Federal:
Current	$	8,817		$	3,351		$	3,568
Deferred	(123		)	(85		)	(313		)
	8,694			3,266			3,255
State:
Current	97			131			158
Deferred	(20		)	28			(21		)
	77			159			137
Foreign:
Current	54			261			212
Deferred	60			(77		)	(51		)
	114			184			161
Provision for income taxes	$	8,885		$	3,609		$	3,553

Schedule Of Difference Between Provision For Income Taxes And Federal Statutory Income Tax Rate To Income Before Provision For Income Taxes

The reconciliation between the federal statutory tax rate applied to income before taxes and our effective tax rate is summarized as follows:

	Year Ended December 31,
	2017		2016		2015
Federal statutory rate	35.0	%	35.0	%	35.0	%
State taxes, net of federal benefit	0.1	%	0.7	%	0.5	%
Foreign earnings at different rates	(10.0	)%	(15.3	)%	(18.5	)%
Research and other credits	(0.6	)%	(0.7	)%	(0.7	)%
Transition Tax	42.9	%	—	%	—	%
Deferred Tax Revaluation	(2.3	)%	—	%	—	%
Other	0.6	%	1.4	%	0.1	%
Effective tax rate	65.7	%	21.1	%	16.4	%

Schedule of Deferred Tax Assets and Liabilities

Significant components of our deferred tax assets and liabilities are as follows (in millions):

	December 31,
	2017			2016
Deferred tax assets:
Net operating loss carryforwards	$	322		$	175
Stock-based compensation	165			212
Reserves and accruals not currently deductible	336			617
Deferred revenue	27			56
Depreciation related	56			88
Research and other credit carryforwards	293			147
Other, net	102			221
Total deferred tax assets before valuation allowance	1,301			1,516
Valuation allowance	(162		)	(126		)
Total deferred tax assets	1,139			1,390
Deferred tax liabilities:
Intangibles	(1,316		)	(104		)
Other	(70		)	(31		)
Total deferred tax liabilities	(1,386		)	(135		)
Net deferred tax assets (liabilities)	$	(247	)	$	1,255

Schedule Of Unrecognized Tax Benefits Roll Forward

The following is a rollforward of our total gross unrecognized tax benefits (in millions):

	December 31,
	2017			2016			2015
Balance, beginning of period	$	1,852		$	1,350		$	661
Tax positions related to current year:
Additions	299			522			675
Reductions	—			—			—
Tax positions related to prior years:
Additions	67			33			45
Reductions	(16		)	(3		)	—
Settlements	(12		)	(49		)	(24		)
Lapse of statute of limitations	(9		)	(1		)	(7		)
Balance, end of period	$	2,181		$	1,852		$	1,350