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Income Taxes (Tables) | 12 Months Ended
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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 |

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