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Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |
Decrease in valuation allowance | $ 32 |  |
Adjustment to additional paid-in-capital for income tax benefits attributable to employee stock compensation | 4 | $ (126) | $ (89)
Deferred tax liabilities from undistributed foreign earnings | 11 |  |
Undistributed foreign earnings | 2,300 |  |
Benefit realized from tax holiday granted | $ 46 | $ 23 | $ 7
Earnings per share impact of tax holiday | $ 0.17 | $ 0.08 | $ 0.02
Unrecognized tax benefits that would impact effective tax rate | $ 240 | $ 200 | $ 174
Accrued potential interest and penalties | 15 | 2 | 4
Liability recorded for interest and penalties | 48 | $ 33 | $ 31
U.S. Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 126 |  |
U.S. State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 110 |  |

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- Definition Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817 + Details
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